七下M2练习题(一)

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初中英语人教新目标七年级下册Unit 2 单元知识巩固练习(附参考答案)

初中英语人教新目标七年级下册Unit 2 单元知识巩固练习(附参考答案)

七年级英语下册Unit 2巩固练习班级考号姓名总分一、单项选择题1.—Do you know the______?—Yes, it’s 10:30.A.ageB.timeC.numberD.address2.What do you usually do ______ Sunday morning?A.toB.atC.onD.in3.It’s ten o’clock in the evening.Let’s_______________ .A.go to schoolB.get upC.have lunchD.go to bed4.The little boy __________ every morning.A.brushes his toothB.brushes his teethC.brush his toothD.brush his teeth5.— ___________ John often __________ school?—No, he isn’t.A.Does; late forB.Is; late toC.Is; late forD.Does; late to6.My father doesn’t like milk.My mother doesn’t like milk, _______.A.tooB.alsoC.orD.either7.He always gets up early every morning,so he is ________ late for school.A.alwaysuallyC.neverD.often8.—________ do you have supper?—At 7:00.A.WhenB.WhereC.WhatD.How9.Doing exercise every day is good ______ your health.A.forB.atC.withD.in10.They often have lunch _______ 12:00.A.inB.atC.onD.for11.This is really a ________ story.We all like it.A.funnyB.bestC.boringD.difficult12.I’m sorry you can’t _____ because we have no water (水) now.A.get upB.take a showerC.take a walkD.go to bed13.Hi,Jane.What time do you get up ________ weekdays?- I usually get up _______ about six o’clock.A.in, atB.on; atC.at ;atD.on; on14.I have a new ________.So I have so much ________ to do .A.work jobB.work at, workC.job; jobD.job; work15.—Do you often go to the gym?—No,_____ .I don' like sports at all.A.alwaysuallyC.neverD.often16.She wants _____ an orange.A to eatB.eatingC.eatD.eats17._____ Mike_____his homework in the evening?A.Do; doB.Do; doesC .Does ;doD.Does ;/18.Dick never eats vegetables, so this is not a _____ life.A.happyB.healthyC.interestingD.sad19.He _____ his homework on Sundays.A doesn’tB.don't doC.doesn't doD.don't20.The vegetable soup __________delicious.Can I have more?A.looksB.tastesC.soundsD.feels二、用所给单词的适当形式填空1.I _______(usual) go to school by bike.2.They always get _______(dress) at seven o’clock.3.Either you nor Susan _______(work) on weekends.4.The old man ________(exercise) every morning.5.I usually_______(take) a shower before breakfast.6.He is a good _______(run).7.She_______ (clean) her room every day.8.His brother gets up very _____,(late) so he doesn’t have breakfast and goes to school ______.(quick)9.My brother ______ (do)his homework in the afternoon.10.About three _______ (quarter)of my friends like English.三、根据短文内容及所给提示,在文中的空白处填写一个正确的单词Michael is a student at an American high school.He usually 1.______ (get) up at sevenin the morning.After that he takes 2._____ shower, eats breakfast and goes to school.His school starts 3.______ eight o’clock.There are four 4. ______ (class) in the morning.Lunch is from eleven to half 5.______ twelve.In the afternoon, classes 6.______ (finish) at four thirty.After that he 7.______(go) home.Dinner is usually at six.He does his homework after dinner.After doing homework, he 8.______ (take) walks with his sister and then it’s time 9.______ beD.Do you know 10.______ he usually goes to bed? It’s at ten.附:参考答案一.单项选择题1-5 BCDBC 6-10 DCAAB11-15 ABBDC 16-20ACBCB二.用所给单词的适当形式填空ually2.dressed3.works4.exercises5.take6.runner7.cleans8.quickly9.does 10.quarters三.根据短文内容及所给提示,在文中的空白处填写一个正确的单词1.gets2.a3.at4.classes5.past6.finishes7.goes8.takes9.for 10.when。

初中英语人教新目标七年级下册Unit 2练习题(附参考答案)

初中英语人教新目标七年级下册Unit 2练习题(附参考答案)

七年级英语下册Unit2练习题班级考号姓名总分一、根据句意及首字母或汉语提示完成单词1.He is n______ late for school.2.You should go to bed _______ (早).3.My parents take a w______ after dinner every day.4.He is at ______ (工作).5.I like reading books b______.6.I often finish my _______ (作业) before dinner.7.It is half p_____ seven, let’s go to school together.8.I go to bed at a ______ (四分之一) to eleven at night.9.You can go to school e______ by bus or by bike.10.We should ______ (刷) our teeth every day.二、用所给词的适当形式填空1.We have time ______ (take) a walk after dinner.2.Don’t eat ______ (quick), it’s bad for your health.3.My brother ______ (work) at a radio station.4.I ______ (not like) playing basketball.5.I always do my homework ______ (one).6.Please brush your ______ (tooth) before breakfast.7.The little girl _____ (go) to bed early.8.The soup (汤) ______ (taste) good.9.You had better clean the table after _____ (eat) dinner.10.We should have a ______ (health) life.三、用恰当的介词填空1.He works ____ a bus station.2.We go to school _____ Monday _____ Friday.3.We always have milk and bread _____ breakfast.4.That’s a funny time _____ breakfast.5.I’m never late _____ school.6.She likes playing basketball _____ school.7.We get up _____ 5:00 am.8.He seldom(很少) go to bed _____ night.9.I often get up _____ school days.10.I often play the piano _____ half an hour.四、单项选择( )1.--_____ do you go to school?-- I usually go to school at eight o’clock.A.What timeB.WhatC.WhenD Where( )2.He likes taking _____ shower every day.A.someB.anC.theD.a( )3.My mum ______ home at 5:00 p.m.every day.A.goB.goesC.go toD.goes to( )4.Lily usually gets up _____.A.at six thirtyB.at thirty sixC.on six thirtyD.on thirty six( )5.We ______ uniforms every day.A.put onB.wearC.dressD.in( )6.Sugar is not good _____ her.A.withB.toC.forD.at( )7.The boy eats _____ quick breakfast because he is late.A.theB./C.aD.an( )8.They ______ Beijing by train.A.getB.arrive atC.reach toD.get to( )9.They usually ______ on weekends.A.do some exerciseB.do some exercisesC.do any exerciseD.do any exercises( )10.I have _____ time for dinner.A.someB.theC.aD.much五、翻译句子1.我们应该每天刷牙。

初中英语外研版七年级下册Module 2 Unit2 练习题(附参考答案)

初中英语外研版七年级下册Module 2 Unit2 练习题(附参考答案)

七年级英语下册M2U2练习题班级考号姓名总分一、根据句意及汉语提示或首字母完成单词1.I want to be the _______ (班长) because I want to help my teachers and classmates.2.I p________ to help you with your English.3.Guilin is a __________ (美丽的) city and everyone likes visiting it.4.I do exercise every day to keep f_______.5.I hope I can get a good _________ (成绩) this term.6.My brother is on the school basketball t_________.7.What’s the __________ (得分) of the match?8.He is r________ to help others.9.Tony is one of the ________ (最好的) students in our class.10.He runs very f________, we can’t catch up with him.二、用所给词的适当形式填空11.Lily, can you help me do some __________ (clean)?12.Sam is good at _________ (swim).13.Betty wants _________ (go) to school by bus.14.He enjoys _________ (read) books after dinner.15.The boy is always ready ______ (help) others.16.Would you like ________ (be) our new monitor?17.What about ________ (have) some cakes for dinner?18.My parents promise ________ (buy) a book for me.19.Daming really wants to be the _________ (clean) monitor.20.There are two basketball _________ (team) on the playground.三、单项选择( )21.Tony is our class _______.He studies very hard.B.monitorC.numberD.teacher( )22.Lily promises _______ me this evening.A.callB.callingC.to callD.calls( )23.Our teacher is always ready _________ our questions.A.answerB.answeringC.to answerD.to answering( )24.You must make the room _______ all the time.A.cleanB.to cleanC.cleaningD.to cleaning( )25.My mum tells me that I must _________ my classmates at school.A.catch up withB.get on well withC.agree withD.be strict with( )26.-- Is she _______ at dancing?-- Yes.She can dance really _______.A.good; goodB.well; wellC.good; wellD.well; good( )27.The old man _______ speak eight languages(语言).A.canB.mayC.mustD.need( )28.The little girl often helps her mother ______ some cleaning.A.doesB.doingC.forD.do( )29.Everybody _______ her, she is a famous actress.A.knowB.knowsC.knewD.is knowing( )30.They always make their room _______.A.bigB.cuteC.strangeD.tidy四、翻译句子31.我确信他会来的。

新北师大版七下第一章平方差训练题

新北师大版七下第一章平方差训练题

新北师大版七年级下册第一章平方差公式训练题一、单选题1、为了应用平方差公式计算(x +2y -1)(x -2y +1),下列变形正确的是( )A .[x -(2y +1)]2 B .[x +(2y +1)]2 C .[x -(2y -1)][x +(2y -1)] D .[(x -2y )+1][(x -2y )-1]2、下列等式不成立的是( )A .(a 十b )2=(-a -b )2 B .(a -b )2=(b -a )2 C .(a -b )2=a 2-b 2 D .(a +b )2=(b +a )23、与(9a -b )的积等于b 2-81a 2的因式为( )A .9a -bB .9a +bC .-9a -bD .b -9a 4、在边长为a 的正方形中挖去一个边长为b 的小正方形(a >b ),再沿虚线剪开,如图(a ),然后拼成一个梯形,如图(b ).根据这两个图形的面积关系,表明下列式子成立的是( )A .a 2-b 2=(a +b )(a -b ) B .(a +b )2=a 2+2ab +b 2 C .(a -b )2=a 2-2ab +b 2 D .a 2-b 2=(a -b )25、下列计算正确的是( )A.(3a +2)(3b -2)=9ab -4 B .(3x -1)(3x -1)=9x 2-1 C .(3a +2)(3a -2)=3a 2-4 D .(3-2a )(-3-2a )=4a 2-96、下列计算能运用平方差公式的是( )A .(m +n )(-m -n ) B .(2x +3)(3x -2)C .(5a 2-b 2c )(bc 2+5a 2) D .23232323()()3434m n m n ---7、下列计算正确的是( )A .(x +5)(x -5)=x 2-10 B .(x +6)(x -5)=x 2-30 C .(3x +2)(3x -2)=3x 2-4 D .(-x -1)(-x +1)=x 2-1 8、(a +3)(a 2+9)(a -3)的计算结果为( )A .a 4+81B .-a 4-81C .a 4-81D .81-a 49、(a +b -c )(a -b +c )等于( )A .a 2-(b -c )2 B .a 2+(b +c )2 C .(a -b )2-c 2 D .(a +b )2-c 210、下列运算正确的是( )A .(5-m )(5+m )=m 2-25 B .(1-3m )(1+3m )=1-3m 2 C .(-4-3n )(-4+3n )=-9n 2+16 D .(2ab -n )(2ab +n )=4ab 2-n 211、在下列多项式的乘法中,可以用平方差公式计算的是( )A .(x +2)(2+x )B .11()(b )22a b a +- C .(-m +n )(m -n ) D .(x 2-y )(x +y 2)12、如图,边长为(m+3)的正方形纸片剪出一个边长为m 的正方形之后,剩余部分又剪拼成一个矩形(不重叠无缝隙),若拼成的矩形一边长为3,则另一边长是( )A .2m+3 B .2m+6 C .m+3 D .m+613、一个非零的自然数若能表示为两个非零自然数的平方差,则称这个自然数为“智慧数”,比如28=82﹣62,故28是一个“智慧数”.下列各数中,不是“智慧数”的是( )A . 987 B . 988 C . 30 D . 3214、如果(2x-3y )(M )=4x 2-9y 2,则M 表示的式子为( ) A .-2x+3y B .2x-3y C .-2xy-3y D .2x+3y15、计算(x-2)(2+x )的结果是( )A .x 2-4 B .4-x 2 C .x 2+4x+4 D .x 2-4x+4 16、计算(2+1)(22+1)(24+1)(28+1)(216+1)+1的结果是( ) A .232 B .264 C .232-1 D .264-117、化简(3+1)(32+1)(34+1)(38+1)得( )A .(38+1)2B .(38-1)2C .316-1D .12(316−1)18、已知424-1可以被60-70之间的某两个整数整除,则这两个数是( ) A .61,63 B .63,65 C .65,67 D .63,64 二、填空题19、从前有一个狡猾的地主,他把一块长为x 米的正方形的土地租给张老汉种植,有一天,他对张老汉说:“我把这块地的一边减少5米,另一边增加5米,继续租给你,你也没有吃亏,你看如何?”张老汉一听觉得没有吃亏,就答应了,回到家中,他把这件事对邻居讲了,邻居一听,说:“张老汉你吃亏了!”张老汉非常吃惊.同学们,你能告诉张老汉这是为什么吗? . 20、探索完全平方公式(1)计算:①(a +b )2=________;②(a -b )2=_______.(2)观察(1)中式子的特点,用语言说出这两等式为两数和(或差)的平方,等于它们的________加(或减)它们的积的________.(3)用等式表示图面积的运算.(a +b )2=________+________+________.21、观察下列各式有什么规律:3×5=42-1;5×7=62-1,11×13=122-1,…请你将发现的规律用n 的表达式表示出来________________________.22、如果x +y =-4,x -y =8,那么代数式x 2-y 2的值是________.23、观察下列乘法运算结果:(x+1)(x-1)=x 2-1;(x 2+x+1)(x-1)=x 3-1;(x 3+x 2+x+1)(x-1)=x 4-1;(x 4+x 3+x 2+x+1)(x-1)=x 5-1…根据上面乘法运算结果的规律计算:(x n-1+x n-2+x n-3+…+x 3+x 2+x+1)(x-1)=________.24、给出下列算式:32-12=8=8×1,52-32=16=8×2;72-52=24=8×3 92-72=32=8×4; …观察上面算式,那么第n 个算式可表示为_______.25、已知(a+b+1)(a+b-1)=63,则a+b= ________.26、18201999⨯=_________.27、大于1000的某数,若加上79成为一个整数的平方;若加上204,又得到另一个整数的平方,则原来这个数为___________.28.如图是四个全等的长方形图形,写出阴影部分面积___________. 29、如果一个正整数能表示为两个连续偶数的平方差,那么称这个正整数为“神秘数”,如4=22-02,12=42-22,20=62-42.因此4、12、20都是“神秘数”.那么两个连续奇数的平方差(取正数)___________(填“是”或“不是”)“神秘数”. 30、若x+y=3,x 2-y 2=21,则x 3+12y 3=__________. 31、计算:20132-2014×2012=__________.32、观察等式22-12=3,32-22=5,42-32=7,…用含自然数n 的等式表示它的规律为_______.33、从边长为a 的大正方形纸板中挖去一个边长为b 的小正方形后,将其裁成四个相同的等腰梯形(如图甲),然后拼成一个平行四边形(如图乙).那么通过计算阴影部分的面积可以验证公式____________. 34、 观察下列各式:(x-1)(x+1)=x 2-1;(x-1)(x 2+x+1)=x 3-1;(x-1)(x 3+x 2+x+1)=x 4-1,根据前面各式的规律可得(x-1)(x n +x n -1+…+x+1)=____________(其中n 为正整数). 三、解答题35、计算:(1)2222111[()()](2)222x y x y x y -++-; (2)(2a -b +c )2.(3)(a+3b)2-2(a+3b)(a-3b)+(a-3b)2;36、运用乘法公式计算:(1)(a+b+c)(a+b-c);(2)(x-3y-1)(x+3y-1);(3)21324x y⎛⎫-+⎪⎝⎭;(4)(a+b)2-(a-b)2.37、计算:22010201020112009-⨯.38、如图1,从边长为a的正方形纸片中剪去一个边长为b的小正方形,再沿着线段AB剪开,把剪成的两张纸片拼成如图2的等腰梯形.(1)设图1中阴影部分面积为S1,图2中阴影部分面积为S2,请直接用含a,b的代数式表示S1、S2;(2)请写出上述过程所揭示的乘法公式.39、计算:(1)(3)(3a b)a b+-; (2)(11(2)(2)22x x---;(3)2111()()()242x x x++-.40、著名数学教育家G.波利亚,有句名言:“发现问题比解决问题更重要”,这句话启发我们:要想学会数学,就需要观察,发现问题,探索问题的规律性东西,要有一双敏锐的眼睛.请先观察,下列算式,再填空.32-1=8×1,52-32=8×2(1)72-52=8×_________;(2)92-72=8×_____;(3)(_________)2-92=8×5;(4)132-(_________)=8×_…;(5)通过观察归纳,用含字母n的式子表示这一规律为__________.41、老师在黑板上写出三个算式:52-32=8×2,92-72=8×4,152-32=8×27,王华接着又写了两个具有同样规律的算式:112-52=8×12,152-72=8×22,…(1)请你再写出两个(不同于上面算式)具有上述规律的算式;(2)用文字写出反映上述算式的规律;(3)证明这个规律的正确性.42、某校象棋决赛阶段共有八名选手参赛,赛制实行单循环赛(即每两名参赛选手都要赛一局,且每局比赛都决出胜负),若一号选手胜a1局,输b1;二号选手胜a2局,输b2局;…,八号选手胜a8局,输b8局.试比较a12+a22+…+a82与b12+b22+…b82的大小,并叙述理由.43、用简便方法计算:21 504933⨯.44、根据以下10个乘积,回答问题:11×29;12×28;13×27;14×26;15×25;16×24;17×23;18×22;19×21;20×20.(1)试将以上各乘积分别写成一个“□2-∅2”(两数平方差)的形式,并写出其中一个的思考过程;(2)将以上10个乘积按照从小到大的顺序排列起来;(3)若用a1b1,a2b2,…,an bn表示n个乘积,其中a1,a2,a3,…,an,b1,b2,b3,…,bn为正数.试由(1)、(2)猜测一个一般性的结论.(不要求证明)45、若20072008, b=20082009a ,试不用将分数化小数的方法比较a、b的大小.试卷答案19.(x +5)(x -5)=x -25,比原来面积少了25米. 20, (1)①a +2ab +b 2;② a 2-2ab +b 2.(2)平方和,2倍.(3)a 2,2ab ,b 2.21, (2n +1)(2n +3)=2n 22|a n -b a n b n ;=m .且|a 1|≥…≥|a -b |,≤…≤a b .22008200820082009==⨯。

七年级数学下-平方差完全平方公式专项练习题

七年级数学下-平方差完全平方公式专项练习题

七年级数学下---平方差、完全平方公式专项练习题平方差:一、选择题1.平方差公式(a+b)(a-b)=a2-b2中字母a,b表示()A.只能是数 B.只能是单项式 C.只能是多项式 D.以上都可以2.下列多项式的乘法中,可以用平方差公式计算的是()A.(a+b)(b+a) B.(-a+b)(a-b C.(13a+b)(b-13a) D.(a2-b)(b2+a)3.下列计算中,错误的有() A.1个 B.2个 C.3个 D.4个①(3a+4)(3a-4)=9a2-4;②(2a2-b)(2a2+b)=4a2-b2;③(3-x)(x+3)=x2-9;④(-x+y)·(x+y)=-(x-y)(x+y)=-x2-y2.4.若x2-y2=30,且x-y=-5,则x+y的值是()A.5 B.6 C.-6 D.-5二、填空题: 5、(a+b-1)(a-b+1)=(_____)2-(_____)2.6.(-2x+y)(-2x-y)=______.7.(-3x2+2y2)(______)=9x4-4y4.8.两个正方形的边长之和为5,边长之差为2,那么用较大的正方形的面积减去较小的正方形的面积,差是_____.三、计算题9.利用平方差公式计算:2023×2113. 10.计算:(a+2)(a2+4)(a4+16)(a-2).B卷:提高题1.计算:(1)(2+1)(22+1)(24+1)…(22n+1)+1(n是正整数);(2)(3+1)(32+1)(34+1)…(32008+1)-401632.2.式计算:2009×2007-20082. 3.解方程:x(x+2)+(2x+1)(2x-1)=5(x2+3).(1)计算:22007200720082006-⨯.(2)计算:22007200820061⨯+.4.广场内有一块边长为2a米的正方形草坪,经统一规划后,南北方向要缩短3米,东西方向要加长3米,则改造后的长方形草坪的面积是多少?5.下列运算正确的是() A.a3+a3=3a6 B.(-a)3·(-a)5=-a8C.(-2a2b)·4a=-24a6b3 D.(-13a-4b)(13a-4b)=16b2-19a26.计算:(a+1)(a-1)=______.C卷:课标新型题1.(规律探究题)已知x≠1,计算(1+x)(1-x)=1-x2,(1-x)(1+x+x2)=1-x3,(1-x)(•1+x+x2+x3)=1-x4.(1)观察以上各式并猜想:(1-x)(1+x+x2+…+x n)=_____ _.(n为正整数)(2)根据你的猜想计算:①(1-2)(1+2+22+23+24+25)=______.②2+22+23+…+2n=______(n为正整数).③(x-1)(x99+x98+x97+…+x2+x+1)=_______.(3)通过以上规律请你进行下面的探索:①(a -b )(a+b )=_______ . ②(a -b )(a 2+ab+b 2)=_____ _. ③(a -b )(a 3+a 2b+ab 2+b 3)=____ __.2.(结论开放题)请写出一个平方差公式,使其中含有字母m ,n 和数字4.完全平方公式变形的应用完全平方式常见的变形有:ab b a b a 2)(222-+=+;ab b a b a 2)(222+-=+ab b a b a 4)(22=--+)(; bc ac ab c b a c b a 222)(2222---++=++1、已知m 2+n 2-6m+10n+34=0,求m+n 的值2、已知0136422=+-++y x y x ,y x 、都是有理数,求y x 的值。

初中七年级 完全平方公式练习题(含答案)

初中七年级 完全平方公式练习题(含答案)

初中七年级 完全平方公式练习题(含答案)一、选择题1.运用乘法公式计算(x +3)2的结果是( )A .x 2+9B .x 2-6x +9C .x 2+6x +9D .x 2+3x +92.下列计算正确的有( )①(a +b )2=a 2+b 2; ②(a -b )2=a 2-b 2;③(a +2b )2=a 2+2ab +2b 2; ④(-2m -3n )2=(2m +3n )2.A .1个B .2个C .3个D .4个3.若用简便方法计算19992,应当用下列哪个式子 ( )A .(2000-1)2B .(2000-1)×(2000+1)C .(1999-1)×(1999+1)D .(1999+1)24.如果多项式x 2+kx +64是某个整式的平方,那么k 的值是( )A .8B .-8C .±8D .±165.若|x +y -5|+(xy -3)2=0,则x 2+y 2的值为( )A .19B .31C .27D .236.如图K -25-1,从边长为(a +4)cm 的正方形纸片中剪去一个边长为(a +1)cm 的小正方形(a >0),剩余部分沿虚线剪拼成一个长方形(不重叠且无缝隙),则长方形的面积为( )图K -25-1A .(2a 2+5a )cm 2B .(3a +15)cm 2C .(6a +9)cm 2D .(6a +15)cm 2二、填空题7.计算:(1)⎝⎛⎭⎫12x -2y 2=______________;(2)(2x +5y )2=______________;(3)(-2x +3y )2=______________; (4)(-2m -5n )2=______________.8.计算:(1)100.12=________;(2)3012=__________.9.已知(x -3y )2=x 2-6xy +ky 2,则k =________.10.(________+y )2=________+xy +y 2.11.整式A 与m 2-2mn +n 2的和是(m +n )2,则A =________.12.已知a +b =3,ab =2,则(a -b )2=________.13.多项式x 2+1添加一个单项式后可变为完全平方式,则添加的单项式可以是________.(任写一个符合条件的单项式即可)三、解答题14.计算:(1)2018·无锡 (x +1)2-(x 2-x );(2)2018·江西 计算:(a +1)(a -1)-(a -2)2;(3)(x +y -3)2.15.先化简,再求值:(1)2018·宁波 (x -1)2+x (3-x ),其中x =-12;(2)(x +y )(x -y )+(x -y )2-(x 2-3xy ),其中x =2,y =12.16.解方程:(2x -3)2-4(x -2)(x +2)=1.17.已知a 2+2ab +b 2=0,求代数式a (a +4b )-(a +2b )(a -2b )的值.18.如图K -25-2,某市区有一块长为(3a +b )米,宽为(2a +b )米的长方形地块,现准备进行绿化,中间有一边长为(a+b)米的正方形区域将修建一座雕像,则绿化的面积是多少平方米?并求出当a=5,b=3时的绿化面积.图K-25-219 已知图K-25-3①是一个长为2m,宽为2n的长方形,沿图中虚线用剪刀均匀分成四小块长方形,然后按图②的形状拼成一个正方形.(1)你认为图②中阴影部分的正方形的边长是多少?(2)请用两种不同的方法求图②中阴影部分的面积.方法一:________;方法二:________.(3)观察图②,你能写出下列三个代数式之间的等量关系吗?(m+n)2;(m-n)2;mn.(4)根据(3)题中的等量关系,解决如下问题:若a+b=8,ab=5,求(a-b)2的值.图K-25-31.C 2.A3.A [解析] A 项,(2000-1)2=19992,故本选项正确;B 项,(2000-1)×(2000+1)=20002-1,故本选项错误;C 项,(1999-1)×(1999+1)=19992-1,故本选项错误;D 项,(1999+1)2=20002,故本选项错误.故选A .4.D [解析] 由完全平方公式的特点可知,当k =±16时,多项式x 2+kx +64是某个整式的平方.故选D .5.A [解析] 因为||x +y -5≥0,(xy -3)2≥0,||x +y -5+(xy -3)2=0,所以x +y =5,xy =3,则x 2+y 2=(x +y)2-2xy =52-2×3=19.6.D7.(1)14x 2-2xy +4y 2 (2)4x 2+20xy +25y 2(3)4x 2-12xy +9y 2 (4)4m 2+20mn +25n 2 8.(1)10020.01 (2)90601[解析] 100.12=(100+0.1)2=1002+2×100×0.1+0.01=10020.01;3012=(300+1)2=3002+2×300+1=90601.9.9 10.12x 14x 2 11.4mn 12.1 [解析] (a -b)2=(a +b)2-4ab =32-4×2=1,故答案为1.13.答案不唯一,如14x 4,2x ,-2x 14.解:(1)原式=x 2+2x +1-x 2+x =3x +1.(2)原式=a 2-1-(a 2-4a +4)=a 2-1-a 2+4a -4=4a -5.(3)原式=(x +y)2-2(x +y)×3+32=x 2+2xy +y 2-6x -6y +9.15.解:(1)原式=x 2-2x +1+3x -x 2=x +1.当x =-12时,原式=-12+1=12. (2)原式=x 2-y 2+x 2-2xy +y 2-x 2+3xy =x 2+xy.当x =2,y =12时,原式= 22+2×12= 4+1=5.16.解:4x 2-12x +9-4(x 2-4)=1,4x 2-12x +9-4x 2+16=1,-12x +25=1,-12x =-24,x =2.17.解:因为a 2+2ab +b 2=0,所以(a +b)2=0,所以a +b =0,所以a(a +4b)-(a +2b)(a -2b)=4ab +4b 2=4b(a +b)=0.18.解:由题意可知绿化面积为(3a +b)(2a +b)-(a +b)(a +b)=6a 2+5ab +b 2-a 2-2ab -b 2=5a 2+3ab.当a =5,b =3时,原式=125+45=170.所以当a =5,b =3时的绿化面积为170平方米.19 解:(1)m -n.(2)(m +n)2-4mn (m -n)2(3)(m +n)2-4mn =(m -n)2.(4)(a -b)2=(a +b)2-4ab.因为a +b =8,ab =5,所以(a-b)2=64-20=44.。

人教版英语七年级下册Unit2练习题及答案解析

人教版英语七年级下册Unit2练习题及答案解析

七下Unit 2 What time do you go to school?第1课时一、根据中文或首字母提示填写单词。

1. --- Maria, can you help your sister get __________ (穿衣)? --- OK.2. Lucas gets up early and he is __________ late for school.3. --- How many students are there in your class? --- __________(四十).4. My mother __________ gets up at six o'clock and then makes breakfast for us.5. Our history teacher often tells us __________ (好笑的) stories in class.二、用括号内所给单词的适当形式填空。

6. You need __________ (brush) your shoes, Mary. It’s too dirty(脏的)!7. There are two __________ (radio) in the room. One is mine and the other is my brother's.8. Alice often __________ (go) to school before seven fifteen.9. A teacher usually works for over eight __________ (hour) a day at school.10. Dad likes __________ (take) a shower in the morning. He usually __________ (do) it three times a week.11. My grandpa __________ to the park to take a walk every morning.12. It's time to brush your__________ boys!13. Scott __________ at a radio station. He likes his job very much.14. Mr. White usually __________ in the morning, so he is very healthy.15. This __________ book is about schools in the US.四、根据中文意思完成句子,每空一词。

七年下册二元一次方程组及不等式应用题练习

七年下册二元一次方程组及不等式应用题练习

12、某童装厂现有甲种布料38米,乙种布料 、某童装厂现有甲种布料 米 乙种布料26 现计划用这两种布料生产L、 两种型号的 米,现计划用这两种布料生产 、M两种型号的 童装共50套 已知做一套L型号的童装需用甲种 童装共 套。已知做一套 型号的童装需用甲种 布料0.5米 乙种布料1米 可获利45元 布料 米,乙种布料 米,可获利 元;做一套 M型号的童装需用甲布料 米,乙种布料 米, 型号的童装需用甲布料0.9米 乙种布料0.2米 型号的童装需用甲布料 可获利30元 设生产L型号的童装为 型号的童装为x套 可获利 元,设生产 型号的童装为 套。 求童装生产有多少种方案? ①求童装生产有多少种方案? 该厂在生产这批童装中, ②该厂在生产这批童装中,当L型号的童装为多 型号的童装为多 少套时,能使该厂所获的利润最大? 少套时,能使该厂所获的利润最大?最大利润为 多少? 多少?
7、有人问一位老师,他所教的班有多少学生,老师说: 、有人问一位老师,他所教的班有多少学生,老师说: 现在班中有一半的学生正在做数学作业, “现在班中有一半的学生正在做数学作业,四分之一 的学生做语文作业,七分之一的学生在做英语作业, 的学生做语文作业,七分之一的学生在做英语作业, 还剩不足6位的学生在操场踢足球 位的学生在操场踢足球。 还剩不足 位的学生在操场踢足球。”试问这个班共有 多少学生? 多少学生? 8、八年级数学兴趣小组在老师带领下去社会实践,其 、八年级数学兴趣小组在老师带领下去社会实践, 中老师有x人 学生数比教师数的7倍多 倍多4人 中老师有 人,学生数比教师数的 倍多 人,且老师和 学生的总数在40和 之间 包括40和 , 之间(包括 学生的总数在 和50之间 包括 和50),求老师和学 生的人数。 生的人数。 9、甲、乙两人各有书若干本,如果甲从乙处拿来10本, 、 乙两人各有书若干本,如果甲从乙处拿来 本 那么甲拥有的书是乙所剩书的5倍 那么甲拥有的书是乙所剩书的 倍;如果乙从甲处拿来 10本,那么乙所有的书与甲所剩的书相等,问甲、乙 本 那么乙所有的书与甲所剩的书相等,问甲、 两人原来各有几本书? 两人原来各有几本书?
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Module 2Unit 1 I can play the piano.一、根据句意及首字母或汉语提示完成单词1. Would you like to play the p_________?2. Who will _______ (教) us this _________ (学期)?3. What is on the __________ (布告栏)?4. I would like to j________ the Piano Club.5. C________ me as your monitor.二、用括号内所给单词的适当形式填空1. Betty likes _________ (draw), but she can’t ______ (play) the piano.2. I’d like ___________ (visit) the Big Ben during the holiday.3. ---Can she dance? ---No, she ________(can).4. Don’t ________ (worry) about your son.5. My pen friend often teaches ______ ( I ) English.6. My father can ________ (cook).7. Betty can speak Chinese really _______ (good).8. ________ (choose) your favourite book.9. Some children are ________ (play) games in the park.10. Ms. Yang often _________ (teach) us to play the piano.三、翻译句子1. 你会打乒乓球吗?Can you _______ _______ ________?2. 那个男孩每天都弹一个小时钢琴。

The boy spends an hour _______ ______ _______ every day.3. 我会讲一点英语。

I can _______ a little ________.4. 我选择我最爱的汉语社团。

I choose my ________ ________ _______.5. 她真的跳得很棒。

她能加入舞蹈社团。

She dances ______ _______. She can _______ the Dance Club.6. 我们可以教她汉语。

We _______ ________ her Chinese.7. 妈妈,不用担心我,我会照顾我自己。

Mum, don’t ______ _______ me. I can look after myself well.8. 王叔叔非常喜欢烹饪。

Uncle Wang _______ ________ very much.9. 汤姆会加入那个俱乐部?________ _______ can Tom join?10. 那个两岁的男孩会说几个词。

但是仅此而已。

The two – year – old boy can say a few words. But _______ ______.四、单项选择( )1. ---_____ he paly basketball? ---No, he ______.A. Is; isn’tB. Can; can’tC. Can; isn’tD. Is; can’t ( )2. He likes playing _____ football after class.A. theB. aC. anD. /( )3. ---Do you want ______ a singer?---No, I’d like to be a doctor.A. toB. beC. to beD. is( )4. ---______ you dance for me?--- Sorry, I ______ dance, but I ______ sing for you.A. Can; can’t; canB. Can; can; canC. Can; can’t; can’tD. Can; can; can’t( )5. I can’t play ________ violin but I can play ______ tennis.A. the; /B. the; theC. /; /D. /; the( )6. Don’t worry ______ me. I’ll try my best and get a good score.A. aboutB. ofC. withD. for( )7. What about ______ the Chinese Club, Tony?A. joinB. joiningC. to joinD. of joining ( )8. The new clubs ______ this term are on the board.A. inB. aboutC. forD. to( )9. Li Lei should ______ an English club this year to improve his English.A. join inB. getC. joinD. send( )10. --- I like rain _____ it makes me feel cool and relaxed.--- So do I.A. orB. soC. butD. because五、完形填空Hello, my name is Sally. I 1._____ new here. I 2._____ reading. I often read books in 3._____ evening. I like dancing 4.____ I can dance very well.5._____ you like dancing? I like singing, too.6._____ favourite singer is Jay Chou. I like running, too. It is my favourite7.____. I can swim and8._____ football, but I can’t play basketball. I often put my football9._____ the bed. I can 10._____ English, but I can’t speak Chinese. That’s me. Thank you. ( )1. A. am B. is C. are D. be( )2. A. do B. like C. can D. does( )3. A. a B. an C. the D. /( )4. A. but B. and C. or D. so( )5. A. Can B. Are C. Do D. Is( )6. A. I B. Me C. My D. He( )7. A. food B. sport C. season D. colour( )8. A. plays B. do C. make D. play( )9. A. under B. in C. of D. to( )10. A. say B. talk C. speak D. tell六、句型转换1. He can ride a bike. (改为一般疑问句)______ he _______ a bike?2. My sister can play the piano. (改为否定句)My sister ______ _______ the piano.3. She can dance. (改为否定句)She ______ _______ dance.4. Bill plays football well. (用can 改写句子)Bill ______ _______ football well.5. Can you ride a horse? (做肯定回答)______, ______ ______.Unit 2 I can run really fast.一、根据句意及首字母完成单词1. Don’t w________. She’ll be all right.2. We’re leaving at eight o’clock, so you have half an hour to get r______.3. I’d like to join the Music C_______ because I can play the piano.4. I love b________ flowers.5. It’s important to stay healthy, so I do exercise every day to keep f______.6. John is a maths teacher. He t________ Grade 7 in a middle school.7. E_________ in class is working hard and we all want to get the b_____ score.8. Boys in Grade 7 always play table tennis b________ lessons or after lunch.9. She keeps her house very t________.10. He plays basketball very well and he is on the school basketball t______.二、用所给词的适当形式填空1. Would you like ________ (be) our new class monitor?2. It’s such a cold day. What about _________ (have) hot pot for supper?3. Daming is good at __________ (swim). What about ________ (they)?4. I promise __________ (call) you when I land.5. Hazel really wants to be the ____________ (clean) monitor.6. Kate, can you do some ___________(wash) with me?7. Tony is always ready ___________ (help) others.8. Betty often __________ (tidy) her bedroom on Sundays.9. He wants _________ (go) to school on foot.10. My sister enjoys _________ (read) a lot.三、翻译句子1. 戴维保证从今以后努力学习。

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