1.100以内加减法(三)连加连减
最新一二年级上学期口算达标标准
一年级（上）数学口算命题要求和检测标准根据人教版一年级数学（上册）教材的编排要求和我校学生特点，制定如下标准：（一）口算命题的范围、范例和比重1．10以内的加减法，占50%。
2．20以内不进位加法及相应的减法，占20%。
3．20以内进位加法，占30%。
4．检测试卷总题量为100道，以直接写出得数为主，有少量在括号内填数的习题和二步计算题（排在最后），试卷命题时，各部分打乱编排。
5．检测的时间为5分钟，不包括写名字的时间。
（二）对学生的达标要求1．达标成绩为正确道数是80道。
2．优秀成绩为正确道数是90道。
（三）考试与教学要求1．每学期最后一个月进行检测；2．统计每个班级的平均成绩、达标率、优秀率；3．教师要加强口算教学和训练，不断提高学生的口算能力。
4．学生做题时要依次做，漏做、不做、或估意做错倒扣分。
九龙湖中心学校教导处二年级（上）数学口算命题要求和检测标准根据人教版二年级数学（上册）教材的编排要求和我校学生特点，制定如下标准：（一）口算命题的范围、范例和比重1．100以内的加减法。
占40%。
（二位数加减二位数进位控制在10%以下）2．表内乘法。
占60%。
3．检测试卷总题量为100道，以直接写出得数为主，有少量二步计算习题（连加、连减、加减、乘加、乘减）和在括号内填数的习题。
（排在最后），试卷命题时，各部分打乱编排。
4．检测的时间为5分钟，不包括写名字的时间。
（二）对学生的达标要求1．达标成绩为正确道数是80道。
2．优秀成绩为正确道数是90道。
（三）考试与教学要求1．每学期最后一个月进行检测；2．统计每个班级的平均成绩、达标率、优秀率；3．教师要加强口算教学和训练，不断提高学生的口算能力。
4．学生做题时要依次做，漏做、不做、或估意做错倒扣分。
九龙湖中心学校教导处【1】Shop assistant: Good morning! (1)______Mrs Watson: Yes. ( 2 )______ I think I wear size six.Shop assistant: The white gloves are on this side. Let’s see … (3)______- Theseare very nice, and they are easy to wash, too.；Mrs Watson: Oh, I’ll try them on. Hmmm … they seem to fit. (4) ______-Shop assistant: Five dollars and twenty centsMrs Watson: All right. ( 5)______ Here’s six dollars.Shop assistant: OK. Here’s your change.Mrs Watson: Thank you.A. What can I do for you？B. Here’s a size six.C. What do you think of them?D. I’ll take them.E. I am looking for a pair of white gloves.F. Can I help you?G. How much are they?【2】A: Hello! ( 1 )_________B: Yes, what is it?A: (2 )______ Could I use your bike again?B: Certainly. ( 3 )________ - Has your bike broken again?A: No, I've lost my key to the bike.B: I see (4)______A: About four o'clock.B: OK. Here is the key ( 5 )______A: Thank you. Bye!A:What happened? B. Is there anyone at home? C: I'm sorry to trouble you. D. I hope everything goes well.E: Be sure to be there on time. F. What's the time? G: Nice to meet you.【3】A: What can I do for you, Sir?B: ( 1) ____________A: For yourself? These are all for young people, ( 2 ) ______B:I like the blue one.A: (3 ) ____________B: Thank you. (4 ) ____________-A: One hundred yuan.B: Oh, it costs too much,A: ( 5)____________ It is cheaper. It is only fifty yuan.B:OK. I'll take it. Thank you.A. I want to buy a hat for myself.B. How much is it?C. What colour do you want?D. What about this one?E: What size do you want? F. OK. Here you are. G. It' s beautiful, isn't it?。
人教版二年级数学上册全册教材分析
人教版二年级数学上册全册教材剖析《责任教导课程尺度试验教材数学二年级上册》是以《数学课程尺度》的根本理念和所划定的教授教养内容为根据,在总结现行九年责任教导小学数学教材研讨和应用经验的基本上编写的.一.教授教养内容这册教材包含下面一些内容：100以内加.减法笔算,表内乘法,熟习长度单位厘米和米,初步熟习角,从不合的角度不雅察物体,数学广角和数学实践运动等. （一）盘算教授教养内容1．100以内的加.减法笔算.以往安插在六年制责任教材第二册里（连加.连减.加减混杂在第三册）.2．表内乘法.（1）表内除法没有联合表内乘法在本册消失,重要目标是疏散难点.（2）仍分成2～6.7～9两段编排,让学生有更多的演习时光.（二）空间与图形1．长度单位（更强调常识的形成进程）内容和义教雷同,但留意让学生阅历同一的长度单位的进程.2．角的初步熟习3．不雅察物体（从不合地位不雅察物体）（三）熟习时光熟习分,熟习即使几分,解决问题（四）数学广角（简略物体的搭配）是新的教授教养内容,本套教材开端体系地.有步调地介绍一些简略的数学思惟,以学生可以懂得的.浅易的方法呈现高级数学思惟办法的内容.这里主如果简略的组合思惟和简略的逻辑推理.（五）实践运动实践运动的编排还处于一个开端阶段,对实践运动的熟习也各不雷同,毕竟什么样的运动才叫实践运动,应当如何进行实践运动,实践运动分哪几个层次,在教材上应当怎么呈现,这确切是有许多问题须要去研讨的.本册教材根据学生所进修的数学常识和生涯经验,实践运动“ 量一量,比一比”,让学生一方面巩固数学常识,这些运动有的在日常生涯中经常会做的,由此领会数学与现实生涯的接洽,感触感染用数学的愉悦,造就学生的数学意识和实践才能.二.教授教养目标这一册的教授教养目标是,使学生： 1．控制100以内笔算加.减法的盘算办法,可以或许准确地进行盘算.初步控制100以内笔算加.减法的估算办法,领会估算办法的多样性. 2．知道乘法的寄义和乘法算式中各部分的名称,熟记全部乘法口诀,闇练地口算两个一位数相乘. 3．初步熟习长度单位厘米和米,初步树立1米.l厘米的长度不雅念,知道1米 =100厘米初步学会用刻度尺量物体的长度（限整厘米）;初步形成估量物体长度的意识. 4．初步熟习线段,会量整厘米线段的长度;初步熟习角和直角,知道角的各部分名称,会用三角板断定一个角是不是直角;初步学会画线段.角和直角. 5．能辨认从不合地位不雅察到的简略物体的外形;6．借助钟面熟习时光单位“分”指点1时=60分.初步熟习几时几分（5分5分地数）,会读写几时几分和几时半.会应用时光的有关常识解决一些简略的现实问题.7．经由过程不雅察.猜测.试验等运动,找出最简略的事物的分列数和组合数,造就学生初步的不雅察.剖析及推理才能,初步形成有次序地.周全地思虑问题的意识.8．领会进修数学的乐趣,进步进修数学的兴致,树立学好数学的信念.9．养成卖力功课.书写整洁的优越习惯.10．经由过程实践运动,体验数学与日常生涯的亲密接洽.四.教授教养措施看完人教版二年级上册数学这册教材,总体感到是：教材构造相符学生进修数学的认知特色和成长纪律;有利于学生智力开辟和才能造就;有利于学生情绪成长,使学生在进修中体验到进修数学的乐趣.教材内容的呈现留意表现学生己有经验和兴致的特色;并供给丰硕的与学生生涯布景有关的素材,让学生有不雅察.操纵.试验及自力思虑的机遇;内容的睁开具有摸索性和凋谢性,表现新的教授教养不雅念和教授教养办法.我们应用教材有如下几点领会：一.有用地萌发和造就学生的不雅察意识和才能教材例题.习题以学生熟习的情景图为依托,所拔取的素材图文并茂.信息量大,具有凋谢性.可选择性.学生要学会从插图中提出数学问题.获得解决问题的有用信息,从而学到有价值的数学,获得必须的数学常识.是以造就学生的不雅察才能和不雅察意识是教授教养的重要责任之一. 二.辨证地懂得算法多样化算法多样化,是问题解决计谋多样化的一种重要表现,是指群体中的解法多样化,而不是指每一个别的解法要多样化.算法多样化,是勉励学生自力思虑.测验测验创新的行动,是让学生测验测验用本身的办法来算,让学生从多角度思虑,控制各自的办法,如许才是算法多样化的本质. 三.科学地掌控教授教养请求从应用这套教材开端至今,越往前走越觉得教材为教师供给的空间之大.如何应用新的教授教养理念,用好教材的资本,驾御好教室;如何将旧教材原有的内容以新的不雅点.新的请求去实行;如何适度掌控新.旧教授教养内容,这些都是重点思虑的问题,也是我们的寻求. 四.灵巧地应用和整合教授教养资本教科书的编排及内容设计很有弹性,存眷了不合学生的数学进修需求,为全部学生都能得到响应的成长供给了空间,付与学生自由思虑的权利.同时,还促使教师思虑教材内容面前的课程价值地点.学生的接收程度等等,灵巧应用教授教养资本.人教版二年级数学上册全册教材剖析熊晓霞。
《100以内的加法和减法——连加、连减和加减混合》数学教学PPT课件(5篇)
再算还剩的南瓜： 84 – 66 = 18（个）
要先算 40 + 26 的和，然后……
要在 84 中 减去……
请你你能试列一出试综。合 算式吗？
如果写成一个算式，应 该使用小括号。
84 –（40＋26）＝ 18 这叫小括号，要先66 算小读括作号：里8的4 。减 40 加 26 的和
二、探索新知
说一说图中告诉我们
课后作业
完成主题课堂作业对应内容。
祝 你 学 习 进 步！
100以内的加法和减法（二）
连加、连减和加减混合
第2课时
小学数学
复习旧知
如何计算30-6-5？
计算30-6-5时，按（ 从左到右 ） 的顺序计算，结果是（11 ）。
情境导入
例2.共有84个大南瓜，李大爷运走了40 个，王叔叔运走了26个。还剩多少个？
84
计算28与34的和, 是62。
用前一个竖式的和加上 22， 求出总数是84。
探究新知
28+34+22= 84
把两个竖式合并为一个竖式计算。
28 + 31 4
62 +2 2
84
探究新知
28+34+22= 84
把三个数写在一起，直接列一个竖式计算。
28 3 4 10 + 21 2 84
探究新知
易错举例
75-36+4= 35
36 + 14
40
75 -4 0
35
错解分析：
此题错在没有按照正确 的运算顺序进行计算。
易错举例
75-36+4= 43
.
75 -3 6
39 +1 4
《连加连减》100以内的加法和减法PPT课件
40 + 26
66
8· 4
－66
18
先算 40 + 26 的和 再算 84 − 66 的差
注意
40+26=66能口算出结 果，可以不写竖式。
在按顺序计算 时，能口算的 要直接口算。
把40+26与84−66列成综合算式 40 + 26 = __6_6__ 84 − 66 = __1_8__
40 + 26 综合算式：84－（40＋26）=18（个） 因为要先算40+26，所以加上小括号。 怎样把这两个算式合并为一 个综合算式呢？
53+18+9=80 （2）11加上30的和，再加上45得多少？
11+30+45=86
变式训练
2.
36元
买这三样，一共花了多少元？
28元 14元
36+28+14=78（元） 36 28
+ 11 4
78
答：一共花了78元。
思维训练
1.一共有多少人？
我的右边有27人。
我的左边有44人。 44+ 3 + 27= 74(人) 答：一共有 74人。
解决问题 共有84个南瓜，李叔叔运走了40个，王叔叔运 走了26个。还剩多少个？ 方法一: 84 − 40 − 26 = 18 ( 个 )
方法二: 40 + 26 = _6_6_(个__) 84 − 66 =1_8_(_个__)
答：还剩18个。
课堂练习
90-58-30=2
.
90 -58 32 -30
课后作业
1.教材第29页练习五第3题； 2.从课时练中选取。
人教版·数学·二年级·上册
二年级数学上册第三单元教学设计二年级上册第三单元教案数学
二年级数学上册第三单元教学设计二年级上册第三单元教案数学一、教学目标1.让学生掌握100以内的加减法运算，能够熟练地进行计算。
2.培养学生独立思考、合作交流的能力，提高解决问题的能力。
二、教学内容1.100以内的加减法运算2.连加连减运算3.加减混合运算三、教学重点与难点1.教学重点：100以内的加减法运算，连加连减运算，加减混合运算。
2.教学难点：加减混合运算，以及运算顺序的掌握。
四、教学过程1.导入新课（1）通过游戏或故事引入本节课的主题。
（2）让学生回顾已学的相关知识，为新课的学习做好铺垫。
2.授课环节（1）讲解100以内的加减法运算规则，通过例题演示，让学生掌握计算方法。
（2）讲解连加连减运算，通过例题演示，让学生理解运算过程。
（3）讲解加减混合运算，通过例题演示，让学生掌握运算顺序。
3.练习环节（1）设计一些简单的练习题，让学生独立完成，巩固所学知识。
（2）设计一些综合性的练习题，让学生合作完成，提高解决问题的能力。
4.小组讨论（1）让学生就所学内容进行小组讨论，分享自己的学习心得。
（2）教师参与讨论，解答学生的疑问。
6.课后作业（1）布置一些针对性的作业，让学生巩固所学知识。
（2）鼓励学生进行自主学习，探索更多数学知识。
五、教学评价1.通过课堂表现、作业完成情况、单元测试等方面，评价学生的学习效果。
2.关注学生的学习兴趣、合作能力、创新能力等方面，进行全面评价。
六、教学反思2.根据学生的反馈，调整教学策略，提高教学质量。
七、教学拓展1.举办数学竞赛，激发学生的学习兴趣。
2.结合生活实际，让学生感受数学的实用价值。
八、教学资源1.教材：二年级数学上册第三单元2.辅助教材：数学练习册、数学故事书等3.教学工具：PPT、黑板、粉笔等九、教学时间1.本节课共2课时2.第一节课：讲解100以内的加减法运算，连加连减运算十、教学建议1.注重培养学生的运算能力，让学生多做题，提高计算速度。
2.鼓励学生进行合作学习，培养团队精神。
小学一年级100以内加减混合(3连加减)口算题
91 + 6 + 1 = 77 - 51 - 11 = 9 - 9 + 30 = 41 + 33 - 61 = 60 - 49 - 8 = 13 + 30 + 13 = 29 + 32 - 34 = 41 + 41 + 9 = 9 + 62 + 28 = 33 + 46 - 34 = 20 - 9 - 8 = 11 - 8 + 92 = 39 + 38 - 28 = 21 + 71 - 23 = 85 + 10 + 5 = 50 + 46 - 93 = 50 - 9 - 35 = 38 + 14 + 42 = 8 + 72 + 19 = 93 + 7 - 49 = 20 + 43 - 21 = 25 - 8 + 18 = 19 + 39 + 20 = 73 + 20 + 6 = 62 - 49 + 68 = 45 - 20 + 65 = 74 - 54 + 76 = 11 + 34 - 45 = 70 + 16 + 14 = 47 - 40 + 84 =63 + 35 - 78 = 43 + 33 + 17 = 70 + 24 - 28 = 63 - 60 - 1 = 55 - 47 + 82 =64 + 14 - 32 = 45 + 10 - 32 = 17 - 12 + 36 = 37 - 13 - 16 = 67 + 17 + 8 = 41 - 34 - 7 = 8 + 44 + 36 = 44 + 23 + 32 = 23 - 16 + 22 = 77 - 11 - 8 = 55 + 29 - 22 = 79 - 73 - 3 = 91 + 7 + 1 = 75 - 26 + 10 = 47 - 24 + 27 = 92 + 8 - 44 = 22 + 67 - 73 = 93 - 51 - 18 = 17 - 6 + 13 = 66 + 16 - 78 = 85 + 6 + 9 = 32 + 65 + 2 = 22 - 6 - 11 = 44 - 9 + 60 = 37 + 45 + 8 = 77 + 23 - 15 = 78 - 30 - 33 = 17 + 83 - 16 = 92 + 6 - 56 = 39 + 39 + 22 = 25 + 68 + 7 = 30 + 58 + 8 = 91 - 72 - 16 = 83 - 69 + 75 = 17 - 6 + 48 = 54 - 33 - 17 = 27 - 9 + 58 = 70 - 28 - 26 = 86 - 27 - 26 = 21 + 12 - 17 = 65 - 29 + 41 = 56 - 33 - 14 = 36 + 10 + 28 = 61 + 18 - 56 = 41 + 45 - 53 = 共计：80 题做对：计时：成绩：171 + 24 - 13 = 76 + 8 - 76 = 31 + 20 - 43 = 70 - 45 - 8 = 36 + 42 - 65 = 47 - 46 + 81 = 12 + 82 - 70 = 11 + 35 + 25 = 88 - 37 + 6 = 79 - 17 - 38 = 83 - 81 + 58 = 28 - 26 + 19 = 81 + 17 - 75 = 23 - 11 + 64 = 28 + 25 - 11 = 58 + 36 - 80 = 37 + 20 + 10 = 12 - 10 + 88 = 44 + 20 + 32 = 47 - 38 + 70 = 24 + 58 - 81 = 47 + 51 - 77 = 89 + 11 - 83 = 26 - 24 + 38 = 60 + 6 + 7 = 53 - 12 - 27 = 56 - 42 - 10 = 9 + 18 - 25 = 82 + 6 + 7 = 48 - 34 - 10 = 11 + 35 + 25 = 39 + 12 + 29 = 37 - 12 + 72 = 20 - 10 - 6 = 36 - 20 + 64 = 11 + 39 + 9 = 48 - 37 + 82 = 16 - 7 + 14 = 63 - 33 + 63 = 93 + 6 + 1 = 92 + 8 - 96 = 87 + 8 - 65 = 14 + 60 - 18 = 92 + 7 + 1 = 83 - 42 - 37 = 88 - 18 - 66 = 87 - 34 - 43 = 35 + 39 + 18 = 8 + 42 - 50 = 61 - 46 + 43 = 78 + 11 + 9 = 20 - 10 - 6 = 24 - 7 + 57 = 83 - 62 - 14 = 58 + 17 + 22 = 36 + 32 - 17 = 24 + 35 - 26 = 62 - 50 - 10 = 58 + 13 - 22 = 77 + 16 + 7 = 61 - 30 + 10 = 56 + 37 + 6 = 91 - 30 - 50 = 24 - 19 + 16 = 90 - 47 + 39 = 51 + 12 - 60 = 56 + 30 - 41 = 78 - 37 + 58 = 45 + 12 - 23 = 46 + 38 - 50 = 76 + 9 + 8 = 59 - 48 + 15 = 54 + 14 + 26 = 22 + 16 + 29 = 69 - 68 - 1 = 8 - 6 - 1 = 33 + 6 + 37 = 33 - 28 - 1 = 73 + 13 - 79 = 73 - 16 - 25 = 共计：80 题做对：计时：成绩：221 - 21 + 21 = 35 + 58 - 31 = 24 - 17 - 7 = 46 + 50 - 14 = 15 + 62 + 11 = 18 + 25 + 57 = 87 + 10 - 95 = 18 - 7 + 63 = 43 + 20 + 12 = 48 + 10 - 17 = 45 + 38 - 74 = 51 + 26 + 15 = 56 + 33 - 69 = 90 + 8 + 2 = 74 - 55 - 6 = 48 - 15 - 28 = 29 - 11 + 71 = 35 + 31 + 31 = 15 - 6 - 8 = 65 - 29 - 32 = 70 - 47 - 21 = 69 - 68 - 1 = 49 + 21 + 29 = 85 - 12 - 14 = 63 + 13 - 35 = 79 + 9 + 9 = 43 - 12 + 27 = 69 + 9 - 55 = 73 - 73 + 76 = 73 - 73 + 54 = 76 + 12 + 11 = 77 - 17 + 18 = 49 + 26 - 58 = 32 + 22 + 41 = 26 - 8 - 9 = 29 - 21 + 52 = 45 + 11 - 49 = 54 + 9 - 38 = 30 + 37 + 33 = 14 + 40 - 35 = 33 - 22 - 6 = 29 - 7 + 26 = 58 - 35 + 10 = 71 + 27 - 57 = 20 - 10 + 20 = 14 + 50 + 9 = 74 + 12 - 51 = 66 + 28 + 2 = 28 - 16 + 75 = 8 - 6 + 28 = 75 + 15 + 7 = 93 + 6 - 20 = 19 - 8 - 6 = 80 - 8 - 59 = 8 + 19 + 20 = 42 + 21 - 39 = 47 - 30 + 78 = 70 + 23 + 6 = 20 + 70 - 34 = 52 + 24 - 19 = 33 - 21 - 8 = 25 + 43 - 41 = 37 + 7 + 28 = 51 + 46 + 3 = 50 + 42 - 77 = 16 + 10 - 6 = 82 - 45 - 10 = 38 - 22 + 50 = 89 - 44 + 51 = 59 + 8 - 12 = 61 + 8 - 47 = 72 - 26 - 18 = 37 + 18 + 24 = 44 + 46 - 63 = 44 + 40 + 13 = 47 - 47 + 57 = 58 + 6 + 35 = 21 + 7 - 13 = 13 + 19 - 30 = 88 - 13 + 22 = 共计：80 题做对：计时：成绩：366 + 34 - 73 = 48 + 52 - 16 = 12 - 11 - 1 = 41 - 20 - 8 = 31 - 14 - 11 = 16 + 52 - 26 = 74 - 36 - 35 = 82 - 9 - 12 = 44 + 56 - 21 = 83 - 42 + 55 = 59 + 41 - 68 = 86 - 72 + 69 = 54 - 19 + 6 = 85 - 30 - 23 = 55 - 29 + 72 = 14 + 67 - 79 = 93 - 15 - 13 = 77 + 17 + 4 = 34 + 23 - 35 = 36 + 40 + 9 = 14 - 7 + 37 = 21 + 23 + 19 = 26 + 27 - 15 = 58 + 27 - 70 = 39 + 51 - 45 = 57 - 34 - 10 = 20 - 15 + 8 = 37 + 28 + 29 = 79 - 46 + 28 = 35 - 11 + 6 = 88 + 12 - 39 = 62 - 15 - 24 = 88 - 46 - 26 = 80 - 75 - 2 = 51 + 25 - 59 = 20 - 7 - 7 = 90 - 29 - 34 = 67 + 23 - 55 = 15 + 46 - 33 = 71 + 16 + 10 = 25 + 8 + 13 = 83 - 56 + 11 = 54 - 29 + 68 = 85 + 9 - 70 = 8 - 7 + 66 = 43 + 12 + 31 = 70 - 15 - 26 = 89 - 75 - 13 = 16 + 56 - 7 = 59 + 8 + 16 = 91 + 6 + 3 = 57 + 16 + 25 = 38 - 7 + 44 = 54 - 39 + 12 = 25 + 32 + 32 = 12 + 54 + 28 = 22 + 46 + 31 = 32 - 20 + 49 = 35 + 57 - 78 = 39 - 7 - 18 = 33 + 16 - 27 = 18 + 38 + 11 = 68 + 14 - 49 = 24 + 8 - 28 = 66 + 22 + 7 = 69 + 15 - 23 = 37 + 35 - 26 = 30 + 44 + 18 = 45 - 9 + 61 = 43 + 47 - 24 = 42 - 8 - 17 = 74 - 9 - 51 = 27 + 62 + 9 = 24 - 6 - 16 = 84 - 24 - 49 = 19 + 25 + 25 = 21 + 32 + 36 = 91 - 83 - 8 = 15 - 13 + 85 = 47 - 10 - 21 = 共计：80 题做对：计时：成绩：490 + 8 - 19 = 82 - 59 - 11 = 64 + 32 + 4 = 38 - 29 + 25 = 28 - 23 + 22 = 54 + 46 - 91 = 77 - 24 - 40 = 8 + 84 + 7 = 74 + 11 - 26 = 86 - 31 + 27 = 93 + 6 + 1 = 26 - 7 + 23 = 14 - 12 + 96 = 53 - 12 + 35 = 59 + 33 + 8 = 71 + 26 - 93 = 18 - 18 + 24 = 31 + 10 + 44 = 84 + 8 - 27 = 78 - 72 + 91 = 27 + 12 + 41 = 13 - 7 - 3 = 8 - 6 + 30 = 70 + 14 + 16 = 58 + 40 - 57 = 44 - 34 + 69 = 12 - 8 + 18 = 38 - 27 + 83 = 68 + 15 - 71 = 54 + 6 + 38 = 81 - 79 - 1 = 76 + 13 + 6 = 13 + 78 - 74 = 18 - 7 - 6 = 15 - 15 + 14 = 36 - 16 + 26 = 83 - 50 + 66 = 64 - 49 + 19 = 14 + 78 - 10 = 93 - 38 + 33 = 70 + 28 - 85 = 28 + 8 + 47 = 59 + 26 + 9 = 27 - 21 - 2 = 48 - 23 - 7 = 54 - 14 - 32 = 28 + 25 - 28 = 66 - 17 - 16 = 57 + 39 - 44 = 65 - 39 + 66 = 67 - 50 + 35 = 82 - 39 - 17 = 80 - 39 - 34 = 28 - 9 + 13 = 56 - 16 + 31 = 89 + 7 - 33 = 57 + 22 + 7 = 23 + 21 - 22 = 67 + 14 + 17 = 77 - 75 + 45 = 88 + 6 + 3 = 63 + 13 - 40 = 38 - 37 - 1 = 64 + 11 - 74 = 25 + 39 - 19 = 9 + 22 + 63 = 15 - 7 - 8 = 74 - 14 - 31 = 70 + 8 - 9 = 19 - 10 + 83 = 35 - 34 + 27 = 64 + 16 - 17 = 93 + 7 - 78 = 80 + 16 + 3 = 37 + 29 + 32 = 59 - 7 - 20 = 8 + 90 + 1 = 77 + 14 + 6 = 32 - 10 - 13 = 9 - 9 + 84 = 共计：80 题做对：计时：成绩：587 + 11 - 42 = 66 - 21 + 48 = 91 + 9 - 78 = 22 - 12 + 28 = 16 + 79 - 42 = 12 - 10 - 2 = 43 + 12 - 24 = 51 - 35 - 16 = 18 - 16 - 1 = 74 - 29 - 10 = 33 - 30 + 73 = 90 - 33 - 31 = 60 + 18 + 14 = 61 + 7 + 9 = 40 - 34 + 81 = 45 - 8 - 17 = 55 - 40 + 83 = 87 + 10 + 2 = 53 + 6 - 19 = 69 + 15 - 71 = 93 - 47 - 38 = 89 + 9 - 59 = 37 - 17 + 27 = 32 + 66 + 1 = 68 - 51 - 7 = 27 + 17 + 42 = 63 - 59 - 3 = 36 - 33 + 47 = 42 + 55 - 43 = 34 - 12 + 17 = 93 + 6 - 31 = 12 - 9 + 89 = 86 + 8 - 78 = 9 + 64 + 6 = 53 + 8 + 29 = 53 + 35 + 6 = 61 - 7 - 28 = 44 + 34 - 64 = 42 + 7 - 45 = 82 - 48 + 19 = 69 - 46 + 74 = 18 + 39 - 36 = 81 + 7 + 11 = 21 + 25 - 32 = 15 - 12 + 85 = 91 - 53 - 24 = 8 + 39 - 45 = 51 - 6 - 8 = 56 + 15 - 63 = 81 - 10 + 22 = 45 + 32 + 23 = 86 - 73 + 78 = 80 - 18 + 27 = 36 - 34 - 1 = 61 + 15 - 76 = 89 + 8 + 1 = 46 + 18 - 53 = 91 - 18 - 23 = 90 - 34 + 20 = 30 - 22 + 57 = 92 - 79 + 6 = 72 + 11 - 47 = 51 + 25 - 41 = 87 + 11 + 2 = 46 + 8 + 41 = 85 - 27 - 45 = 70 - 12 - 33 = 10 - 6 - 2 = 81 - 12 + 28 = 68 - 54 + 82 = 28 - 10 + 78 = 41 - 23 - 8 = 15 - 12 + 67 = 72 + 10 + 18 = 35 - 32 + 61 = 10 - 6 + 90 = 12 + 25 + 40 = 64 + 6 + 30 = 84 + 11 - 28 = 20 - 9 - 7 = 共计：80 题做对：计时：成绩：661 - 30 + 66 = 57 - 29 - 8 = 64 + 24 - 76 = 36 + 33 + 16 = 78 + 16 + 5 = 15 + 22 + 35 = 31 + 64 - 35 = 44 - 10 + 39 = 85 + 12 + 1 = 61 + 32 + 6 = 57 + 8 - 29 = 80 - 39 - 12 = 16 + 41 - 8 = 18 - 16 - 1 = 76 - 67 - 6 = 8 + 87 - 89 = 28 - 15 + 31 = 9 - 6 - 2 = 55 + 35 + 8 = 84 - 75 - 9 = 80 + 13 - 52 = 24 + 29 + 12 = 38 + 31 + 21 = 71 + 23 - 90 = 73 - 10 - 61 = 19 - 17 - 2 = 13 + 71 + 14 = 83 + 14 + 2 = 61 + 13 - 10 = 62 + 19 - 40 = 83 + 12 - 42 = 58 - 32 - 7 = 34 - 31 - 3 = 39 + 19 - 47 = 46 + 17 + 16 = 92 - 35 + 40 = 12 + 57 - 33 = 44 + 50 + 3 = 55 + 18 - 12 = 89 + 11 - 24 = 17 + 56 + 6 = 27 - 22 + 43 = 73 + 6 + 17 = 22 + 74 + 4 = 21 - 15 - 5 = 49 + 7 - 33 = 71 + 28 - 54 = 68 + 31 - 19 = 16 + 8 + 16 = 74 - 40 - 21 = 70 + 28 - 83 = 73 + 6 - 25 = 76 + 15 - 58 = 14 - 11 + 65 = 69 - 37 - 30 = 62 + 31 - 77 = 16 + 41 + 28 = 72 + 8 - 32 = 79 - 78 - 1 = 18 + 37 - 9 = 50 - 27 + 22 = 81 - 21 - 21 = 64 + 33 - 9 = 40 + 30 + 7 = 43 - 17 + 9 = 90 - 89 - 1 = 72 - 65 + 36 = 27 - 15 - 8 = 10 + 15 + 29 = 43 - 23 + 72 = 73 + 13 + 10 = 74 + 26 - 84 = 77 - 62 - 9 = 44 + 29 - 21 = 88 - 78 - 9 = 76 + 21 + 3 = 68 + 15 - 52 = 56 + 21 - 7 = 65 - 21 + 8 = 39 + 6 - 22 = 共计：80 题做对：计时：成绩：760 - 28 - 25 = 77 - 75 + 72 = 64 - 25 - 24 = 80 - 67 - 10 = 62 + 14 - 37 = 13 + 57 + 13 = 38 - 24 + 81 = 60 - 35 - 13 = 56 - 37 + 31 = 60 - 8 - 31 = 52 - 17 + 25 = 55 - 27 - 22 = 66 + 25 - 23 = 13 + 22 - 22 = 56 - 8 - 12 = 9 + 69 - 21 = 31 - 29 + 14 = 21 + 56 + 23 = 19 + 36 - 24 = 66 + 14 + 20 = 90 - 7 - 72 = 25 - 17 + 30 = 90 + 7 - 71 = 28 - 26 + 6 = 58 + 29 - 80 = 79 - 14 - 35 = 82 - 47 - 9 = 73 - 6 - 17 = 82 + 15 - 25 = 62 + 21 - 52 = 11 + 54 - 60 = 50 + 42 + 7 = 62 + 29 + 7 = 14 + 8 - 10 = 90 + 7 - 53 = 8 + 32 - 24 = 68 - 54 - 12 = 50 - 34 - 11 = 19 - 15 - 3 = 44 + 31 + 11 = 84 - 73 + 67 = 37 + 43 - 25 = 84 - 66 - 13 = 91 + 7 + 2 = 10 + 49 - 34 = 53 + 19 - 27 = 21 + 75 + 1 = 9 - 8 - 1 = 35 + 15 - 16 = 54 + 14 - 28 = 15 - 12 + 6 = 63 - 30 + 38 = 29 + 41 + 22 = 80 + 16 + 3 = 32 + 40 + 27 = 73 - 23 - 9 = 62 - 56 + 65 = 22 + 11 - 23 = 66 - 11 + 12 = 52 + 12 - 63 = 40 - 15 - 17 = 71 - 49 + 21 = 26 + 58 - 65 = 64 - 44 + 59 = 50 - 11 + 20 = 86 - 82 + 85 = 82 - 27 - 39 = 14 + 28 - 30 = 12 - 6 - 3 = 88 + 8 + 3 = 26 + 32 - 50 = 69 + 6 - 64 = 68 - 50 + 7 = 41 - 16 + 54 = 11 - 9 - 2 = 67 + 25 - 28 = 85 + 9 - 88 = 59 - 31 - 20 = 91 + 7 + 2 = 33 + 36 - 58 = 共计：80 题做对：计时：成绩：835 - 9 - 21 = 68 - 68 + 19 = 73 + 15 + 6 = 61 + 32 + 6 = 39 + 26 + 23 = 33 - 13 - 16 = 59 + 6 + 35 = 64 - 23 - 22 = 51 - 17 + 7 = 84 + 6 - 43 = 18 + 40 + 42 = 34 + 47 - 67 = 63 + 26 - 37 = 38 + 27 + 25 = 38 + 49 - 40 = 50 - 9 - 40 = 31 + 68 - 53 = 82 - 60 + 56 = 88 + 8 - 66 = 90 + 6 + 1 = 28 + 10 - 17 = 56 - 11 - 21 = 74 - 72 + 82 = 17 + 68 + 11 = 33 + 18 - 39 = 82 + 10 - 38 = 10 + 40 - 6 = 8 + 78 - 71 = 78 + 17 - 70 = 72 + 17 - 32 = 10 - 8 - 2 = 47 + 24 + 9 = 86 + 10 - 56 = 26 + 42 + 30 = 28 + 57 + 10 = 20 + 15 + 19 = 36 - 16 + 20 = 44 + 17 - 47 = 64 + 16 + 10 = 66 + 14 - 39 = 39 + 16 - 27 = 10 + 25 - 27 = 9 + 23 + 41 = 45 + 50 - 57 = 30 + 30 - 35 = 74 - 35 + 7 = 39 - 38 + 30 = 8 + 6 - 11 = 29 + 23 - 25 = 71 - 27 - 6 = 67 - 10 + 17 = 84 + 14 - 8 = 11 - 7 - 3 = 77 + 12 - 44 = 34 - 6 + 25 = 76 + 17 + 6 = 83 + 17 - 15 = 57 - 23 - 7 = 50 - 40 + 17 = 9 - 6 + 18 = 35 + 51 - 42 = 12 + 16 + 59 = 21 + 9 + 61 = 35 + 8 - 8 = 11 + 54 + 21 = 79 - 18 - 28 = 68 + 25 - 59 = 73 + 7 - 15 = 92 + 6 + 2 = 79 + 20 - 94 = 68 + 16 + 8 = 11 + 85 + 2 = 45 + 21 - 14 = 53 - 28 - 12 = 30 - 26 + 65 = 8 + 38 - 46 = 15 + 6 + 7 = 47 - 44 - 2 = 86 - 12 - 23 = 80 + 15 - 17 = 共计：80 题做对：计时：成绩：993 + 7 - 71 = 68 - 27 + 15 = 58 - 42 - 16 = 64 + 19 - 76 = 47 + 21 - 19 = 70 - 33 + 6 = 82 - 75 + 59 = 13 + 80 + 6 = 68 - 20 - 7 = 18 - 17 - 1 = 45 - 23 + 57 = 16 + 63 - 16 = 74 - 40 - 25 = 28 - 7 + 10 = 51 + 32 + 7 = 65 + 34 - 84 = 66 - 13 - 47 = 73 - 40 + 17 = 15 - 12 + 15 = 17 - 13 + 11 = 53 + 45 - 89 = 71 + 6 + 17 = 65 + 33 + 1 = 42 + 51 + 6 = 45 + 14 + 33 = 75 + 9 - 38 = 78 - 22 - 28 = 40 + 35 - 57 = 54 - 49 + 20 = 69 - 58 + 28 = 10 + 22 - 28 = 57 + 29 + 13 = 26 - 13 + 63 = 65 + 24 + 6 = 54 + 38 + 7 = 54 - 19 + 34 = 16 + 13 - 23 = 66 + 9 + 19 = 10 - 6 - 2 = 61 + 38 + 1 = 60 - 21 + 11 = 13 + 30 - 24 = 85 + 10 - 94 = 9 + 37 + 40 = 61 - 7 + 43 = 52 + 37 + 10 = 35 - 31 + 30 = 51 - 29 - 15 = 14 - 10 - 4 = 79 - 14 + 32 = 89 + 6 + 1 = 70 + 23 - 29 = 44 - 42 + 15 = 11 - 7 - 3 = 28 + 54 - 38 = 56 - 7 + 9 = 75 - 42 - 30 = 70 + 10 + 16 = 57 + 31 + 8 = 21 - 6 + 17 = 24 - 23 + 59 = 78 - 37 + 59 = 26 + 67 - 60 = 38 + 54 - 19 = 51 + 33 + 11 = 49 + 22 - 18 = 75 + 20 + 5 = 36 + 39 - 34 = 47 + 38 + 14 = 19 + 52 - 12 = 58 - 22 + 47 = 70 - 43 - 21 = 34 - 28 - 3 = 24 - 11 - 11 = 62 - 9 - 37 = 64 + 22 + 9 = 81 - 8 + 8 = 60 - 22 - 19 = 21 + 49 + 21 = 78 - 45 - 10 = 共计：80 题做对：计时：成绩：1066 + 12 + 8 = 35 + 50 - 47 = 41 + 48 - 48 = 28 + 33 - 18 = 8 + 59 + 20 = 46 - 20 - 26 = 44 - 35 + 53 = 20 + 39 + 18 = 75 - 9 + 16 = 64 + 21 + 15 = 11 - 10 - 1 = 42 - 26 - 9 = 21 - 15 + 17 = 10 + 60 + 6 = 43 + 55 - 48 = 27 + 67 + 2 = 27 - 10 + 48 = 29 - 24 + 54 = 62 + 10 - 37 = 25 + 40 - 24 = 87 + 7 - 75 = 34 - 8 - 20 = 86 + 11 - 76 = 37 - 9 - 10 = 64 - 46 + 65 = 89 - 61 - 14 = 80 - 74 - 4 = 41 + 17 + 14 = 69 - 10 - 23 = 79 + 15 - 73 = 93 + 6 - 79 = 35 + 8 - 34 = 8 + 89 - 61 = 38 + 15 - 29 = 23 - 12 - 9 = 25 + 37 + 27 = 49 + 24 - 72 = 43 - 22 - 8 = 53 - 24 + 68 = 28 - 13 + 9 = 51 + 41 + 7 = 10 - 6 + 36 = 65 - 61 + 71 = 87 + 8 + 5 = 77 - 33 + 11 = 24 + 71 - 52 = 84 + 7 + 9 = 56 + 11 + 24 = 33 - 30 + 68 = 66 + 17 + 17 = 72 + 6 + 14 = 44 + 17 + 10 = 56 + 41 - 48 = 79 - 39 - 28 = 32 - 20 + 56 = 91 - 62 + 10 = 42 + 33 - 35 = 65 - 26 - 13 = 85 + 9 + 2 = 24 - 9 - 15 = 61 + 12 - 31 = 58 - 56 - 1 = 88 - 20 + 20 = 20 - 19 - 1 = 9 + 84 + 6 = 77 - 65 - 11 = 49 - 37 + 59 = 88 + 6 - 68 = 78 - 47 - 19 = 74 - 12 + 26 = 38 - 17 + 21 = 56 - 9 - 36 = 82 - 73 - 6 = 34 - 11 - 11 = 31 + 16 - 18 = 54 - 26 + 56 = 18 + 50 - 34 = 48 - 33 - 15 = 26 - 21 - 3 = 85 + 15 - 59 = 共计：80 题做对：计时：成绩：1143 - 17 - 22 = 27 - 22 + 78 = 81 - 66 - 15 = 47 - 15 - 28 = 75 - 52 + 67 = 53 + 6 - 10 = 22 + 23 - 25 = 78 - 51 - 20 = 68 + 17 - 75 = 76 + 21 + 2 = 33 - 20 + 69 = 23 + 24 + 31 = 78 - 66 - 12 = 25 - 13 - 9 = 36 + 9 - 25 = 18 - 10 + 87 = 34 - 11 + 25 = 91 - 16 + 15 = 43 - 23 - 8 = 53 + 10 - 43 = 92 - 88 + 53 = 25 + 46 + 25 = 48 - 37 - 7 = 51 - 36 + 13 = 53 + 28 - 20 = 83 + 11 - 20 = 26 - 10 + 55 = 21 - 14 + 35 = 67 + 31 - 57 = 70 - 14 - 18 = 53 - 21 - 13 = 41 - 28 - 9 = 63 + 23 - 27 = 16 - 11 - 2 = 81 + 8 + 10 = 45 - 27 - 9 = 56 + 18 + 13 = 92 - 26 - 30 = 36 - 18 - 9 = 18 - 10 + 55 = 75 + 19 - 6 = 11 + 83 - 24 = 85 + 8 + 6 = 65 - 42 + 46 = 82 + 6 + 7 = 60 - 42 - 13 = 30 - 20 - 10 = 51 + 9 + 28 = 17 + 8 + 42 = 47 + 20 + 17 = 44 - 13 - 17 = 57 - 25 - 28 = 56 - 38 - 11 = 48 + 37 - 66 = 15 + 73 - 48 = 53 - 16 + 14 = 20 - 12 + 80 = 79 - 48 - 8 = 82 - 51 - 11 = 11 + 32 - 13 = 68 + 32 - 97 = 71 - 40 - 27 = 49 - 39 + 61 = 90 + 7 - 72 = 29 - 12 + 13 = 76 + 7 + 17 = 66 + 33 + 1 = 65 - 14 + 33 = 28 + 41 + 10 = 77 - 46 - 17 = 83 + 11 + 3 = 22 + 61 + 11 = 72 + 23 - 25 = 60 - 49 + 8 = 53 + 7 - 46 = 18 + 32 - 26 = 15 - 13 - 2 = 33 - 24 + 64 = 69 - 22 + 51 = 71 - 16 - 43 = 共计：80 题做对：计时：成绩：1229 - 23 + 89 = 59 - 10 - 45 = 91 - 31 - 32 = 61 - 45 - 12 = 39 - 28 + 76 = 59 + 9 - 63 = 47 + 40 + 8 = 81 - 57 + 57 = 39 - 23 - 10 = 54 + 10 + 22 = 88 - 37 - 23 = 25 + 33 - 39 = 69 - 31 + 36 = 48 - 48 + 51 = 37 + 25 - 35 = 34 - 28 + 21 = 24 + 74 - 46 = 93 + 7 - 7 = 13 - 9 + 37 = 27 + 56 - 50 = 59 + 10 - 52 = 82 - 46 + 52 = 66 - 34 + 19 = 48 - 7 - 36 = 17 + 61 + 15 = 73 - 23 - 40 = 41 + 29 + 30 = 42 + 40 - 26 = 36 - 16 - 14 = 60 - 19 + 57 = 25 + 66 - 79 = 78 + 21 + 1 = 60 - 53 + 15 = 80 + 16 + 3 = 69 - 34 + 56 = 88 - 42 - 37 = 84 - 23 + 39 = 74 - 18 - 9 = 40 + 44 + 15 = 46 - 21 - 8 = 33 + 21 - 38 = 66 + 29 + 2 = 38 + 12 - 48 = 10 + 79 - 7 = 86 + 10 + 4 = 15 + 49 - 51 = 76 - 61 - 15 = 59 + 19 + 16 = 73 - 38 - 24 = 57 - 33 + 28 = 10 - 9 - 1 = 54 + 31 + 11 = 31 + 15 + 36 = 26 - 10 - 15 = 91 + 7 + 1 =68 + 28 + 1 = 80 - 63 + 55 = 8 - 6 + 9 = 87 + 6 - 86 = 37 + 20 - 37 =69 + 23 - 6 = 83 + 13 - 52 = 55 + 15 - 29 = 62 - 20 - 30 = 18 - 10 - 6 = 79 + 8 - 51 = 40 + 30 - 42 = 31 + 65 - 32 = 73 + 24 - 52 = 24 + 54 + 17 = 45 + 17 - 25 = 29 - 11 - 16 = 82 - 6 + 23 = 23 + 42 - 29 = 86 - 13 - 6 = 9 + 53 + 34 = 31 + 26 - 57 = 8 + 81 + 8 = 33 - 9 - 14 = 78 + 11 + 6 = 共计：80 题做对：计时：成绩：1385 + 10 - 56 = 13 - 6 - 6 = 57 + 39 + 1 = 67 + 8 + 11 = 10 - 9 + 31 = 11 - 9 + 31 = 61 + 34 + 5 = 79 - 20 + 38 = 55 - 22 - 18 = 30 - 23 + 11 = 33 - 14 + 80 = 79 + 17 - 9 = 91 + 6 - 16 = 50 - 34 + 42 = 34 - 26 + 75 = 17 - 16 + 95 = 27 - 18 - 7 = 15 + 69 - 71 = 40 + 11 - 6 = 19 - 16 - 3 = 30 + 37 + 30 = 40 - 33 - 6 = 49 + 7 - 8 = 67 + 32 - 93 = 30 + 24 - 17 = 46 - 35 + 19 = 56 + 20 - 28 = 38 + 18 - 13 = 24 + 31 - 22 = 14 - 9 - 1 = 55 - 6 + 37 = 52 - 9 - 41 = 39 + 39 + 12 = 78 + 17 + 4 = 78 - 47 - 14 = 78 + 17 - 67 = 66 + 7 + 12 = 57 - 11 + 51 = 64 + 36 - 6 = 56 - 42 - 7 = 21 + 8 - 7 = 72 + 21 - 66 = 48 + 16 - 26 = 54 + 20 - 55 = 59 + 38 - 46 = 44 + 54 - 66 = 84 + 9 - 13 = 17 + 37 - 36 = 11 + 35 - 44 = 46 - 24 + 38 = 49 + 12 - 27 = 54 - 36 + 63 = 72 - 71 + 94 = 46 + 31 - 61 = 79 + 15 + 4 = 37 + 59 + 2 = 61 - 47 - 10 = 51 + 47 + 2 = 61 - 59 + 55 = 74 + 14 - 48 = 75 - 52 + 15 = 63 - 13 + 47 = 59 - 20 - 27 = 73 + 26 + 1 = 57 + 31 - 15 = 39 - 8 - 11 = 67 + 7 - 62 = 66 - 35 + 66 = 70 + 23 - 36 = 59 - 21 + 19 = 56 + 10 - 26 = 14 + 33 - 44 = 65 + 28 + 7 = 22 - 8 - 10 = 73 + 19 - 8 = 75 + 17 + 7 = 40 - 13 + 47 = 93 + 7 - 40 = 74 + 19 - 17 = 30 - 9 - 11 = 共计：80 题做对：计时：成绩：1458 - 40 - 16 = 80 + 10 + 10 = 18 - 12 - 4 = 16 + 27 - 11 = 55 - 20 + 44 = 41 - 37 - 3 = 25 + 23 + 14 = 45 - 24 - 7 = 62 + 37 + 1 = 92 - 28 - 21 = 70 + 20 + 6 = 80 + 9 - 77 = 10 + 72 - 66 = 86 - 69 - 17 = 91 - 82 + 50 = 28 - 10 - 7 = 46 - 9 + 10 = 61 + 22 - 25 = 53 + 36 - 57 = 46 + 20 - 45 = 33 - 13 - 19 = 69 - 68 - 1 = 73 - 32 + 58 = 58 + 29 - 19 = 75 - 63 + 78 = 58 - 53 + 21 = 91 + 6 - 64 = 49 + 39 - 78 = 92 - 35 + 34 = 93 + 6 - 51 = 72 - 49 - 10 = 45 - 11 - 17 = 49 + 40 - 78 = 59 + 13 - 48 = 30 - 27 - 1 = 10 + 12 - 18 = 27 + 62 - 50 = 93 - 37 + 23 = 85 - 23 - 59 = 73 + 22 - 69 = 9 - 6 - 3 = 71 + 20 - 51 = 54 - 21 + 19 = 49 - 22 - 25 = 55 + 33 - 68 = 64 + 7 + 27 = 32 + 32 + 21 = 24 - 14 - 10 = 59 - 6 + 33 = 64 - 37 + 59 = 20 + 66 + 10 = 11 - 6 + 13 = 39 - 28 - 11 = 16 - 11 + 78 = 78 + 21 - 36 = 37 - 26 + 11 = 9 - 6 - 3 = 21 - 19 - 1 = 53 + 14 + 9 = 31 - 24 - 7 = 79 + 6 - 38 = 77 + 20 - 14 = 76 - 28 - 36 = 49 + 34 - 19 = 29 - 15 - 14 = 42 - 29 + 85 = 90 - 79 - 11 = 35 - 25 - 10 = 17 - 10 - 6 = 76 - 59 + 77 = 55 - 38 - 8 = 8 + 69 + 23 = 16 - 12 - 4 = 50 - 22 - 15 = 69 - 13 + 34 = 51 + 19 - 62 = 20 - 8 - 9 = 59 + 29 - 7 = 81 - 10 + 14 = 37 + 46 + 9 = 共计：80 题做对：计时：成绩：1548 - 24 + 33 = 34 - 9 + 68 = 12 + 72 - 68 = 16 - 7 - 8 = 57 - 55 + 55 = 44 - 40 - 3 = 55 - 17 - 6 = 24 + 22 + 33 = 21 - 8 + 29 = 74 - 61 + 83 = 91 + 6 + 3 = 55 + 33 - 14 = 48 - 33 + 37 = 44 + 20 - 41 = 51 - 51 + 68 = 77 + 17 - 20 = 80 - 19 - 57 = 19 + 7 - 26 = 61 - 55 + 47 = 92 + 7 - 98 = 69 - 25 + 45 = 50 + 13 - 27 = 18 - 6 + 78 = 40 - 20 + 40 = 29 - 18 + 86 = 43 + 47 - 90 = 67 + 31 - 45 = 38 - 16 - 7 = 42 + 47 + 10 = 84 - 43 + 41 = 14 - 11 + 96 = 9 + 31 - 25 = 69 + 25 - 60 = 62 - 49 - 6 = 86 + 10 + 1 = 43 - 15 + 71 = 92 + 6 + 1 = 77 + 6 - 72 = 91 - 58 - 7 = 42 + 38 - 65 = 30 + 44 - 74 = 29 - 24 - 3 = 13 + 9 + 40 = 90 + 6 - 92 = 77 + 14 + 6 = 10 + 35 - 21 = 83 - 77 - 2 = 34 + 53 + 6 = 53 + 16 - 33 = 19 - 12 - 7 = 60 - 22 + 44 = 59 + 34 + 6 = 48 + 15 - 26 = 26 - 23 + 67 = 41 - 23 - 14 =47 + 21 - 10 = 8 + 67 + 22 = 18 - 15 + 94 = 58 - 34 - 21 = 55 + 41 - 76 =48 + 48 + 4 = 47 - 42 - 1 = 66 - 50 + 29 = 83 + 11 + 6 = 17 + 59 - 54 = 54 + 31 - 7 = 82 + 10 - 49 = 63 + 26 - 71 = 9 - 8 - 1 = 32 - 31 + 43 = 59 + 17 + 23 = 14 - 8 + 63 = 37 + 46 - 65 = 20 - 6 - 14 = 28 - 14 + 46 = 9 - 8 - 1 = 89 + 11 - 97 = 54 + 7 + 19 = 71 + 13 + 8 = 79 + 18 - 68 = 共计：80 题做对：计时：成绩：1658 + 18 - 39 = 13 + 15 + 53 = 75 - 62 + 19 = 80 + 9 + 8 = 63 + 8 - 24 = 49 - 17 - 27 = 82 + 13 + 4 = 90 - 53 - 21 = 82 - 28 + 16 = 57 + 32 - 79 = 78 + 7 + 14 = 44 + 31 + 8 = 66 + 16 + 12 = 87 + 8 - 14 = 38 + 20 - 9 = 8 - 7 + 18 = 33 - 21 + 85 = 82 + 17 + 1 = 11 - 8 + 63 = 56 + 6 + 21 = 88 + 6 + 3 = 9 - 7 + 69 = 49 - 36 - 7 = 62 - 37 + 28 = 43 - 17 - 26 = 57 + 26 - 54 = 31 + 6 + 36 = 40 + 55 - 60 = 60 + 8 - 10 = 10 - 7 - 1 = 26 - 20 + 52 = 13 + 84 + 3 = 78 - 32 + 48 = 57 - 33 + 74 = 53 + 39 - 57 = 42 - 9 + 45 = 75 - 59 + 29 = 77 + 10 + 8 = 42 + 40 + 9 = 87 + 13 - 59 = 25 - 7 - 13 = 91 + 9 - 53 = 54 - 38 - 8 = 61 + 21 - 79 = 46 + 52 + 1 = 9 - 6 + 95 = 60 - 24 - 35 = 65 - 43 + 31 = 75 - 47 - 27 = 27 - 12 - 11 = 23 + 6 - 22 = 48 - 39 + 76 = 65 - 42 - 23 = 24 + 37 + 14 = 90 - 75 + 81 = 31 + 66 - 50 = 55 - 20 + 25 = 66 + 21 - 85 = 39 + 47 - 28 = 70 + 26 + 2 = 52 + 29 + 8 = 84 - 40 - 35 = 49 - 40 - 6 = 29 + 65 - 11 = 81 - 10 + 10 = 67 - 13 + 38 = 38 + 26 + 7 = 16 - 7 - 8 = 13 + 60 + 9 = 56 - 10 + 24 = 46 + 26 + 20 = 74 + 8 + 16 = 34 + 17 - 12 = 9 - 6 + 41 = 90 - 32 + 35 = 88 - 41 + 35 = 71 + 9 - 60 = 8 + 58 + 29 = 19 - 6 - 12 = 28 - 18 - 7 = 共计：80 题做对：计时：成绩：1761 - 40 + 14 = 15 + 55 + 18 = 70 + 29 - 36 = 60 + 28 - 49 = 76 - 64 + 28 = 90 + 8 - 70 = 81 + 12 - 22 = 85 - 12 - 10 = 67 - 66 - 1 = 72 + 11 - 22 = 65 - 56 - 7 = 73 + 13 + 11 = 15 + 83 + 1 = 36 - 6 + 28 = 8 + 13 - 18 = 75 + 18 - 35 = 16 + 54 + 22 = 65 - 15 - 37 = 40 - 27 + 28 = 52 + 26 + 16 = 42 + 24 + 31 = 17 + 49 + 14 = 74 + 9 + 11 = 81 - 65 + 83 = 16 - 9 - 6 = 65 + 34 - 30 = 53 + 27 - 33 = 93 - 55 - 36 = 53 - 11 - 23 = 36 - 29 + 86 = 9 + 87 - 29 = 23 - 14 + 29 = 8 + 72 - 20 = 55 - 12 + 19 = 86 - 68 - 12 = 82 - 13 - 26 = 24 - 10 + 64 = 21 + 66 + 13 = 45 + 47 + 8 = 86 + 11 + 2 = 40 - 11 - 14 = 33 - 21 + 50 = 78 - 18 + 15 = 88 + 7 - 82 = 72 - 64 - 7 = 84 - 61 - 13 = 15 + 35 + 33 = 55 - 26 + 55 = 17 - 13 + 6 = 65 - 47 + 45 = 34 - 11 + 28 = 16 - 8 + 58 = 85 + 10 + 2 = 89 + 9 + 2 = 65 - 13 + 26 = 77 + 13 - 71 = 17 + 59 - 26 = 32 - 12 + 57 = 73 - 42 + 26 = 92 + 6 - 93 = 17 - 7 - 7 = 22 - 20 - 2 = 59 - 54 - 4 = 16 - 10 + 24 = 66 + 32 + 2 = 86 + 7 + 6 = 58 - 22 - 26 = 24 + 37 - 36 = 53 + 8 - 35 = 8 + 29 - 9 = 70 - 13 - 28 = 26 + 34 - 38 = 71 + 28 - 51 = 39 - 36 + 37 = 82 - 21 + 18 = 25 + 9 - 7 = 20 + 51 + 6 = 93 - 61 - 21 = 56 - 33 - 20 = 42 + 15 - 34 = 共计：80 题做对：计时：成绩：1817 + 26 + 44 = 84 + 7 + 6 = 21 + 45 - 13 = 19 - 18 + 98 = 68 - 40 + 55 = 65 + 16 - 76 = 28 - 11 - 16 = 61 - 25 + 24 = 64 + 29 - 15 = 38 - 14 - 7 = 36 + 55 - 19 = 81 - 30 + 22 = 62 - 48 - 14 = 87 - 10 + 23 = 17 + 15 - 23 = 51 + 13 + 35 = 42 + 12 - 52 = 77 - 14 - 60 = 63 - 27 + 11 = 72 + 12 - 24 = 72 + 6 + 9 = 55 + 35 - 88 = 92 + 6 - 66 = 67 + 23 - 29 = 16 + 83 + 1 = 86 + 7 + 6 = 24 + 35 + 31 = 39 + 39 + 11 = 12 - 10 + 47 = 93 + 7 - 98 = 34 + 35 - 18 = 32 - 17 + 39 = 73 + 14 - 6 = 76 - 73 + 66 = 27 - 26 + 86 = 13 + 82 + 2 = 84 - 41 - 31 = 30 - 25 + 92 = 87 - 27 - 52 = 48 - 26 - 22 = 88 - 47 + 50 = 29 + 27 - 12 = 64 + 26 - 30 = 73 - 17 - 13 = 67 - 30 + 14 = 11 - 9 - 1 = 46 + 49 - 82 = 28 - 10 - 6 = 24 - 7 - 13 = 31 - 28 - 3 = 77 + 12 - 29 = 70 - 15 + 25 = 58 + 8 + 25 = 57 - 25 - 32 = 35 + 51 - 40 = 24 + 30 + 21 = 69 - 43 - 21 = 21 + 11 + 38 = 76 + 9 + 10 = 72 - 24 - 41 = 75 + 16 + 6 = 84 - 80 - 4 = 66 + 18 + 6 = 42 - 12 + 66 = 42 + 28 + 30 = 61 + 7 - 24 = 44 - 18 - 26 = 27 + 50 - 46 = 54 + 9 + 33 = 36 + 35 + 11 = 61 - 47 - 12 = 24 - 15 + 48 = 65 + 28 + 6 = 26 + 63 - 87 = 38 + 54 - 60 = 8 + 50 + 20 = 67 + 28 + 1 = 17 + 25 + 25 = 83 - 8 + 17 = 48 - 46 + 53 = 共计：80 题做对：计时：成绩：1973 + 11 - 67 = 63 - 59 - 4 = 79 + 11 + 7 = 54 - 25 - 14 = 24 + 47 - 50 = 64 + 21 - 11 = 37 + 8 + 42 = 21 + 51 + 9 = 87 - 50 - 31 = 78 - 29 + 30 = 24 - 15 - 9 = 15 - 9 - 1 = 23 + 67 + 6 = 42 + 20 - 44 = 70 + 22 + 6 = 85 - 50 + 26 = 15 + 13 - 12 = 91 - 18 - 43 = 37 + 14 - 31 = 70 + 14 + 11 = 40 - 12 + 33 = 88 - 68 + 53 = 33 + 38 + 24 = 19 + 28 + 41 = 51 + 31 + 8 = 48 - 25 + 41 = 45 - 20 + 47 = 44 + 20 - 13 = 40 + 29 + 26 = 87 + 10 + 3 = 71 + 19 - 37 = 75 - 73 - 1 = 27 - 13 + 20 = 27 + 8 - 11 = 79 + 20 - 36 = 77 + 21 - 30 = 91 - 70 + 28 = 9 - 6 - 3 = 91 - 86 - 2 = 13 - 9 - 1 = 21 + 68 + 9 = 23 + 13 + 52 = 51 - 47 - 4 = 50 + 16 - 23 = 76 + 19 + 5 = 17 - 9 + 19 = 83 + 11 + 6 = 9 - 6 + 83 = 10 + 49 + 41 = 85 - 32 - 7 = 52 - 17 - 23 = 9 - 7 - 1 = 87 - 27 - 25 = 19 + 24 + 54 = 33 + 40 - 26 = 65 + 11 - 16 = 37 + 28 + 21 = 63 - 39 + 17 = 73 + 24 + 1 = 22 + 23 + 23 = 38 + 33 - 24 = 93 + 7 - 15 = 33 - 21 - 9 = 50 + 14 - 26 = 54 - 12 - 42 = 18 + 80 + 1 = 87 + 8 - 92 = 45 + 53 + 2 = 65 - 23 - 24 = 16 - 8 + 56 = 79 + 7 + 7 = 73 + 13 + 6 = 24 - 6 + 56 = 19 - 17 - 2 = 65 + 11 + 15 = 91 + 7 - 29 = 79 + 16 + 4 = 60 - 7 - 28 = 60 + 37 - 50 = 80 - 70 + 57 = 共计：80 题做对：计时：成绩：2076 - 73 + 44 = 44 + 29 + 15 = 58 + 14 + 21 = 54 - 26 - 20 = 84 + 15 + 1 = 87 + 12 + 1 = 51 - 11 - 16 = 70 - 36 - 18 = 86 + 13 - 75 = 84 + 14 - 22 = 26 + 66 - 11 = 87 + 10 - 36 = 11 - 9 + 16 = 69 + 24 + 7 = 37 + 42 - 60 = 20 - 19 + 31 = 91 - 17 - 21 = 82 + 16 - 73 = 71 - 50 + 15 = 89 - 23 + 13 = 56 - 37 - 19 = 45 + 27 - 60 = 89 - 78 + 56 = 84 - 6 - 14 = 28 + 27 - 46 = 74 - 69 - 2 = 23 + 9 - 25 = 25 + 59 - 31 = 88 + 9 + 3 = 62 - 32 + 43 = 65 - 33 - 22 = 74 - 32 - 12 = 90 - 49 - 14 = 40 + 15 - 23 = 13 - 11 + 51 = 63 + 17 - 76 = 50 + 42 + 8 = 47 - 29 + 22 = 53 + 34 - 85 = 80 + 18 + 1 = 20 + 28 - 17 = 41 + 44 - 29 = 88 - 22 - 37 = 62 + 25 + 8 = 58 - 22 - 30 = 93 - 60 + 41 = 55 + 13 - 60 = 60 - 54 - 1 = 56 - 30 + 16 = 22 + 42 - 45 = 85 - 15 - 28 = 23 - 17 - 6 = 69 - 12 - 20 = 11 - 7 - 2 = 57 + 6 - 6 = 37 + 41 + 22 = 76 + 13 + 8 = 92 - 57 - 19 = 71 + 8 + 9 = 79 - 72 - 6 = 23 - 20 - 2 = 61 - 36 - 11 = 14 - 6 - 8 = 91 - 26 - 9 = 15 - 11 - 4 = 54 + 19 - 26 = 9 + 53 + 29 = 76 + 18 - 32 = 18 - 14 + 60 = 10 + 28 - 18 = 11 - 8 + 60 = 81 - 38 + 31 = 74 - 59 - 9 = 83 + 6 - 8 = 82 - 38 + 27 = 45 - 10 + 38 = 44 + 48 - 60 = 80 + 12 - 84 = 59 - 49 - 6 = 52 - 23 + 34 = 共计：80 题做对：计时：成绩：2137 - 9 + 63 = 50 - 10 - 24 = 55 - 45 + 65 = 9 - 7 - 2 = 59 + 21 + 11 = 16 - 14 + 97 = 59 + 10 - 51 = 11 + 49 + 13 = 8 - 6 - 1 = 24 + 44 + 15 = 25 - 10 - 12 = 44 + 14 + 9 = 48 + 19 + 9 = 55 + 45 - 80 = 90 - 78 - 10 = 66 - 65 - 1 = 24 + 69 + 6 = 24 + 46 - 55 = 9 + 88 - 93 = 72 - 45 - 27 = 44 - 7 - 6 = 72 - 67 - 5 = 34 + 41 + 23 = 33 + 55 + 11 = 85 - 50 - 20 = 55 + 6 + 31 = 36 - 6 - 14 = 76 - 60 + 28 = 29 - 22 + 46 = 23 - 7 + 66 = 90 - 80 + 73 = 13 - 8 + 31 = 58 - 6 + 7 = 68 - 68 + 77 = 51 - 40 - 8 = 57 - 53 - 3 = 12 + 28 - 22 = 66 - 21 + 38 = 42 + 54 + 1 = 31 + 61 + 7 = 89 + 7 - 45 = 25 - 18 - 7 = 81 - 67 - 12 = 32 + 23 + 26 = 54 - 21 + 22 = 78 + 8 + 8 = 79 + 14 - 86 = 14 + 25 + 27 = 20 - 14 + 40 = 74 + 21 - 17 = 11 + 47 - 12 = 79 - 23 - 37 = 75 - 42 - 24 = 80 - 43 - 27 = 83 + 11 - 57 = 30 - 6 + 22 = 70 - 58 - 8 = 18 + 51 - 14 = 73 + 14 - 58 = 19 - 13 - 4 = 70 - 30 + 12 = 54 - 32 + 64 = 39 + 29 + 22 = 15 - 7 + 8 = 33 - 21 + 82 = 54 + 6 + 6 = 13 + 7 - 9 = 8 - 7 + 72 = 65 - 59 - 3 = 75 + 8 + 6 = 11 + 35 - 46 = 69 - 11 - 43 = 68 - 45 + 41 = 75 - 13 - 25 = 43 + 16 - 30 = 75 + 11 + 10 = 87 - 77 + 90 = 90 - 51 + 9 = 69 + 20 + 9 = 56 - 13 - 25 = 共计：80 题做对：计时：成绩：2224 - 24 + 21 = 80 - 17 + 8 = 77 + 6 + 14 = 39 + 20 - 15 = 44 - 41 - 1 = 27 - 20 + 81 = 88 - 47 - 8 = 60 - 58 + 41 = 52 + 10 + 33 = 65 + 9 + 15 = 20 + 79 - 93 = 33 + 24 + 25 = 88 - 13 - 38 = 17 + 29 - 42 = 75 - 74 + 96 = 85 - 9 + 23 = 80 + 14 - 66 = 68 + 28 - 59 = 79 - 70 - 8 = 36 + 58 + 2 = 17 - 14 + 94 = 69 - 10 - 14 = 53 + 22 - 38 = 85 - 35 - 9 = 68 - 35 + 18 = 17 - 11 + 87 = 69 + 22 - 42 = 67 - 7 + 33 = 13 + 77 - 70 = 91 - 30 - 46 = 22 + 68 + 9 = 69 - 26 + 40 = 51 - 38 + 27 = 72 + 20 + 6 = 65 + 31 - 82 = 18 - 13 + 20 = 77 + 7 + 16 = 72 - 60 + 77 = 51 + 32 + 11 = 81 + 18 + 1 = 30 - 10 - 14 = 17 - 9 + 79 = 86 - 78 + 59 = 56 + 42 + 1 = 47 - 12 + 55 = 36 - 23 - 8 = 58 + 13 + 17 = 55 - 17 - 35 = 9 + 43 + 28 = 52 + 19 - 68 = 65 + 16 + 12 = 80 - 69 - 11 = 61 - 42 + 19 = 42 + 12 + 12 = 36 + 31 + 14 = 33 + 65 - 97 = 20 - 20 + 81 = 41 + 58 - 30 = 13 - 11 - 2 = 28 + 64 - 73 = 71 + 28 - 56 = 64 + 13 + 21 = 86 - 20 - 38 = 67 + 27 - 9 = 39 + 47 - 38 = 22 - 13 - 7 = 73 - 28 - 6 = 59 + 23 + 9 = 81 - 55 + 19 = 30 - 20 - 7 = 47 - 23 - 11 = 71 + 23 + 2 = 18 + 6 - 12 = 10 - 7 - 2 = 46 - 37 - 8 = 81 + 6 + 9 = 80 - 21 + 20 = 19 + 33 - 17 = 74 + 8 + 12 = 43 - 19 - 20 = 共计：80 题做对：计时：成绩：2391 + 8 - 70 = 67 - 46 + 27 = 34 - 20 + 64 = 69 + 23 + 8 = 58 - 19 + 58 = 19 - 13 - 6 = 93 + 6 - 83 = 60 - 59 - 1 = 24 + 21 + 33 = 16 - 14 + 73 = 42 - 24 - 16 = 12 - 8 + 35 = 43 + 12 - 41 = 36 + 62 - 64 = 31 - 25 - 5 = 50 + 7 + 17 = 67 + 16 - 42 = 75 + 22 - 49 = 80 - 80 + 81 = 27 - 26 + 36 = 84 - 29 - 18 = 83 - 51 - 31 = 32 + 57 + 9 = 77 + 13 - 45 = 85 - 39 + 33 = 8 + 91 + 1 = 58 - 32 - 12 = 90 - 18 - 71 = 92 + 6 - 47 = 77 + 18 + 1 = 52 - 9 + 10 = 80 + 7 + 9 = 84 - 8 + 11 = 45 - 14 + 9 = 88 - 75 + 38 = 46 - 21 - 21 = 81 + 15 - 23 = 71 - 44 - 8 = 93 - 30 + 14 = 68 + 21 + 6 = 72 - 6 + 26 = 69 + 9 + 6 = 76 + 16 + 8 = 80 + 16 - 25 = 74 + 7 - 20 = 43 - 28 - 6 = 80 - 54 - 8 = 24 + 14 + 58 = 42 - 21 + 75 = 10 + 35 - 26 = 48 - 8 + 8 = 85 - 65 - 8 = 29 + 31 + 39 = 25 - 18 - 6 = 34 + 18 - 49 = 16 + 54 + 25 = 42 + 36 - 18 = 89 + 9 + 1 = 51 - 18 - 11 = 20 - 19 + 50 = 55 - 47 + 31 = 83 - 8 - 41 = 41 - 27 + 60 = 9 + 88 + 1 = 24 + 33 - 20 = 85 - 15 + 10 = 77 + 13 + 9 = 18 + 16 - 17 = 48 + 42 - 56 = 74 + 17 - 58 = 23 - 12 + 6 = 61 - 7 - 42 = 70 - 46 - 24 = 67 - 61 + 75 = 60 - 15 + 24 = 81 + 6 + 12 = 49 + 35 - 44 = 10 + 82 - 91 = 45 + 19 + 7 = 74 - 60 - 9 = 共计：80 题做对：计时：成绩：24。
2023年新苏教版小学二年级上数学知识点及巩固练习
新苏教版小学二年级上数学知识点及巩固练习一、教材内容：1．100以内的加、减法（三）2.平行四边形的初步结识3.表内乘法（一）4.表内除法（一）5.厘米和米6.表内乘法和表内除法（二）7.观测物体二、教学目的：1．知识技能：(1)使学生能列竖式计算100以内的连加,连减和加减混合计算,掌握比较简便的竖式书写方法。
理解并掌握求比一个数多（少）几的数是多少的实际问题的数量关系，能解决相关的实际问题。
（2）使学生联系具体情境，初步结识乘，除法的含义，探索并理解乘法口诀，能熟记乘法口诀，能纯熟地口算表内乘除法，能联系乘除法的含义，应用学过的表内乘除法计算解决一些简朴的实际问题。
（3）使学生通过观测，操作，思考和交流等活动，初步结识四边形，五边形和六边形等平面图形，初步结识线段，初步建立1厘米，1米的实际长度表象，会用厘米和米作单位测量线段或物体的的长度，会用如“第几排第几个”的方式描述物体的位置。
在观测同一个物体时，初步体会从不同位置看到的物体的形状有时是不同的。
2．数学思考:(1)使学生在结识乘法，除法的含义以及编制乘法口诀的过程中，进一步丰富对100以内数的结识，发展数感和初步的抽象思维。
（2）使学生在结识图形，测量长度，拟定位置，辨认方向，观测物体等活动中，进一步感受简朴平面图形的特性，初步建立1厘米和1米实际长度的表象，学会用合适的方式描述物体间的位置关系，初步体会物体与它相应的视图的联系，发展空间观念。
（3）使学生在用乘法口诀计算相应的除法，用表内乘除法计算解决简朴的实际问题，选择合适的长度单位测量，估计物体或线段的长度。
3．问题解决：（1）使学生在教师的指导下，联系学过的数与计算，空间与图形的知识和方法从生活中提出并解决一些简朴的实际问题，发展初步的数学应用意识。
（2）使学生在用学过的乘除法计算解决简朴实际问题的过程中，初步学会借助摆学具，画图形等方法理解图中的数量关系，初步学会根据需要解决的问题选择合适的已知条件。
运算定律知识点
运算定律知识点1．100以内加减法【知识点归纳】（1）加数+加数＝和，被减数﹣减数＝差（2）一个加数＝和﹣另一个加数，被减数＝差+减数，减数＝被减数﹣差．（3）求几个数的和，a+b+c＝（a+b）+c，a+b+c+d＝[（a+b）+c]+d（4）任何一个数加上或减去0，仍得这个数．（5）一个数减去它自身，差为零．（6）某数先减去一个数，再加上同一个数，某数不变；或某数先加上一个数，再减去同一个数，某数不变．性质：（1）加法的“和”加“和”的性质，若干个数的和加上若干个数的和，可将第一个和中的各个加数分别加上第二个和中的一个加数，再把所得的和加起来．例：（a1+a2+…+a n）+（b1+b2+…+b n）＝（a1+b1）+（a2+b2）+…+（a n+b n）（2）在无括号的加减混合或连减的算式中，改变运算顺序，结果不变．例：a+b﹣c＝a﹣c+b，或a﹣b﹣c＝a﹣c﹣b（3）一个数加上两个数的差，等于这个数加上差里的被减数，再减去差里的减数（简称为数加差的性质）例：a+（b﹣c）＝a+b﹣c（4）一个数减去两个数的和，等于这个数依次减去和里的各个加数（简称数减和的性质）例：a﹣（b+c）＝a﹣b﹣c（5）一个数减去两个数的差，等于这个数减去差里的被减数，再加上差里的减数（简称数减差的性质）例：a﹣（b﹣c）＝a﹣b+c（6）若干个数的和减去若干个数的和，可以把第一个和中的各个加数，分别减去第二个和中不大于它的一个加数，然后，把所得的差加起来（简称和减和的性质）例：（a1+a2+…+a n）﹣（b1+b2+…+b n）＝（a1﹣b1）+（a2﹣b2）+…+（a n﹣b n）【命题方向】常考题型：例1：一个三位数，三个数字的和是26，这个数是（）A、899B、999C、898分析：根据选项，把每个选项的数字之和计算出来，与题意相符的就是正确的选项．解：根据题意可得：A选项的数字之和是：8+9+9＝26；B选项的数字之和是：9+9+9＝27；C选项的数字之和是：8+9+8＝25；只有A选项的数字之和与题意符合．故选：A．点评：从每个选项给出的数出发，求出各个选项的数字之和，再进一步解答即可．例2：小明把36﹣12+8错算成36﹣（12+8），这样算出的结果与正确的结果相差16．分析：要先求出36﹣12+8的最后结果，然后求出36﹣（12+8）的最后结果，然后把结果进行相减．解：36﹣12+8＝32，36﹣（12+8）＝16，32﹣16＝16；故答案为：16．点评：此类题先求出正确的结果，然后算出看错算式计算的结果，最后把结果相减即可．2．整数四则混合运算【知识点归纳】1．加、减、乘、除四种运算统称四则运算．加法的意义：把两个（或几个）数合并成一个数的运算叫做加法．减法的意义：已知两个加数的和与其中的一个加数求另一个加数的运算叫做减法．减法中，已知的两个加数的和叫做被减数，其中一个加数叫做减数，求出的另一个加数叫差．乘法的意义：一个数乘以整数，是求几个相同加数的和的简便运算，或是求这个数的几倍是多少．除法的意义：已知两个因数的积与其中一个因数求另一个因数的运算叫做除法．在除法中，已知的两个因数的积叫做被除数，其中一个因数叫做除数，求出的另一个因数叫商．四则运算分为二级，加减法叫做第一级运算，乘除法叫做第二级运算．2．方法点拨：运算的顺序：在一个没有括号的算式里，如果只含有同一级运算，要从左往右依次计算；如果含有两级运算，要先算第二级运算，再算第一级运算．在有括号的算式里，要先算括号里的，再算括号外的．【命题方向】常考题型：例1：72﹣4×6÷3如果要先算减法，再算乘法，最后算除法，应选择（）A、72﹣4×6÷3B、（72﹣4）×6÷3C、（72﹣4×6）÷3分析：72﹣4×6÷3的计算顺序是先算乘法，再算除法，最后算减法，要把减法提到第一步，需要只给减法加上小括号．解：72﹣4×6÷3如果要先算减法，再算乘法，最后算除法，应为：（72﹣4）×6÷3；故选：B．点评：本题考查了小括号改变运算顺序的作用，看清楚运算顺序，是把哪一种运算提前计算，在由此求解．例2：由56÷7＝8，8+62＝70，100﹣70＝30组成的综合算式是（）A、100﹣62+56÷7；B、100﹣（56÷7+62）；C、不能组成分析：由于56÷7＝8，8+62＝70，则将两式合并成一个综合算式为56÷7+62＝70，又100﹣70＝30，则根据四则混合运算的运算顺序，将56÷7＝8，8+62＝70，100﹣70＝30组成的综合算式是：100﹣（56÷7+62）．解：根据四则混合运算的运算顺序可知，将56÷7＝8，8+62＝70，100﹣70＝30组成的综合算式是：100﹣（56÷7+62）．故选：B．点评：本题考查了学生根据分式及四则混合运算的运算顺序列出综合算式的能力．3．加法交换律加法交换律4．加法结合律加法结合律5．乘法结合律乘法结合律6．运算定律与简便运算【知识点归纳】1、加法运算：①加法交换律：两个加数交换位置，和不变．如a+b＝b+a②加法结合律：先把前两个数相加，或先把后两个数相加，和不变．如：a+b+c＝a+（b+c）2、乘法运算：①乘法交换律：两个因数交换位置，积不变．如a×b＝b×a．②乘法结合律：先乘前两个数，或先乘后两个数，积不变．如a×b×c＝a×（b×c）③乘法分配律：两个数的和，乘以一个数，可以拆开来算，积不变．如a×（b+c）＝ab+ac④乘法分配律的逆运算：一个数乘另一个数的积加它本身乘另一个数的积，可以把另外两个数加起来再乘这个数．如ac+bc＝（a+b）×c3、除法运算：①除法性质：一个数连续除以两个数，可以先把后两个数相乘，再相除．如a÷b÷c＝a÷（b×c）②商不变规律：被除数和除数同时乘上或除以相同的数（0除外）它们的商不变．如a÷b ＝（an）÷（bn）＝（a÷n）÷（b÷n）（n≠0 b≠0）4、减法运算：减法性质：一个数连续减去两个数，可以用这个数减去两个数的和．如a﹣b﹣c＝a﹣（b+c）【命题方向】常考题型：例1：0.65×201＝0.65×（200+1）＝0.65×200+0.65运用了乘法的（）A、交换律B、结合律C、分配律分析：乘法分配律的概念为：两个数的和乘另一个数，等于把这个数分别同两个加数相乘，再把两个积相加，得数不变，用字母表示：（a+b）c＝ac+ac．据此可知，0.65×201＝0.65×（200+1）＝0.65×200+0.65运用了乘法分配律．解：根据乘法分配律的概念可知，0.65×201＝0.65×（200+1）＝0.65×200+0.65运用了乘法分配律．故选：C．点评：本题利用具体的算式考查了学生对于乘法分配律的理解．例2：125×25×32＝（125×8）×（25×4），这里运用了（）A、乘法交换律B、乘法结合律C、乘法交换律和乘法结合律分析：在125×25×32＝（125×8）×（25×4）中，是把32看作8×4，然后用乘法交换律变成125×8×25×4，再运用乘法结合律计算，即（125×8）×（25×4）．解：125×25×32＝（125×8）×（25×4），运用了乘法交换律和乘法结合律．故选：C．点评：此题重点考查了学生对乘法交换律和结合律的掌握与运用情况．7．加减法中的巧算【知识点归纳】1、加法交换律：两个数相加交换两个加数的位置，和不变．形如：a+b＝b+a2、加法结合律：三个数相加，先把前面两个数相加，再同第三个数相加；或者先把后两个数相加，再同第一个数相加，它们的和不变．形如：（a+b）+c＝a+（b+c）3、减法的运算性质：在减法中，被减数减去若干个减数，可以减去这些减数的和，差不变．形如：a﹣b﹣c＝a﹣（b+c）4、以上运算定律、性质同样适用于多个加数或减数的计算中5、添去括号原则：在加减法运算中，如果给加号后面的算式添上或去掉括号，原运算符号不变；如果给减号后面的算式添上或去掉括号，其添上或去掉括号部分的运算符号要改变．即“+”变“﹣”，“﹣”变“+”【命题方向】常考题型：例1：1000+999﹣998﹣997+996+…+104+103﹣102﹣101＝（）A、225B、900C、1000D、4000分析：将算式四个分为一组，然后找一下共有几组这样的数，然后根据规律解答．解：1000+999﹣998﹣997+996+…+104+103﹣102﹣101，＝（1000+999﹣998﹣997）+（996+995﹣994﹣993）+…+（104+103﹣102﹣101），＝4×225，＝900．故选：B．点评：此题也可这样理解：此算式除了1000和后三项103﹣102﹣101，其它每四个数字为一组，结果为0，因此此算式的结果为1000+103﹣102﹣101＝1000+（103﹣102）﹣101＝1000+1﹣101＝900．经典题型：例2：899999+89999+8999+899+89分析：四个加数都加1减1，化成整百、整千、整万、…的数，然后再计算；解：①899999+89999+8999+899+89，＝（900000﹣1）+（90000﹣1）+（9000﹣1）+（900﹣1）+（90﹣1），＝999990﹣5，＝999985；点评：考查了简便运算，灵活运用所学的运算律简便计算．【解题方法点拨】加减法的巧算方法有以下几种：1、几个数相加，利用加法的交换律和结合律，将加数中能凑成整十、整百、整千等的一些加数交换左右顺序，先进行结合，然后再与其他的一些加数相加，得出结果．2、在加减法混合算式与连减算式中．运用“减法的运算性质”进行简算，在简算过程中一定要注意，“+”号和“﹣”号的使用．3、几个相近的数相加，可以选择其中一个数，最好是整十、整百的数为“基准数”，再把大于基准数的数写成基准数与一个数的和，小于基准数的数，写成基准数与一个数的差，将加法改为乘法计算．4、几个数相加减时，如不能直接“凑整”，我们可以利用加整减零，减整加零变更被减数用减数来间接“凑整”．。