期中检测卷(2)
期中检测卷(2)(解析版)

∴ −3− 33 < a < −3+ 33,∴ 1 ≤ a < −3+ 33,
x2
+
1 x2
= x1−x2 x1x2−1 ,
x1x2
由于x1,x2 ∈ 1,2 ,且x1 < x2,所以x1 − x2 < 0,x1x2 > 1,x1x2 − 1 > 0, 所以 f x1 − f x2 < 0,即 f x1 < f x2 ,所以函数 f x 在区间 1,2 为增函
数,所以 f x max = f 2
卷 II(非选择题)
二、 填空题 (本题共计 4 小题 ,每题 5 分 ,共计 20 分 )
x + 1,x ≥ 0,
13. 若函数 f x =
则 f − 2 =__________.
f x + 2 ,x < 0,
【答案】1 【解答】解:f( − 2) = f( − 2 + 2) = f(0) = 0 + 1 = 1.故答案为:1.
【答案】D
【解答】解:对任意的x1,x2
∈
[0,
+
∞)(x1
≠
x2
),有f(x2)−f(x1)
x2−x1
<
0,
可知 f x 在[0, + ∞)上单调递减,
因为 f x 是偶函数,所以 f x 在 − ∞,0 上单调递增,
又因为− 3 <− e <− 2,所以 f − 3 < f − e < f − 2 ,
x−1
A.[0, 1) ∪ (1, 2] B.[0, 1) ∪ (1, 4] C.[0, 1)
D.(1,4]
2023春人教版小学四年级语文下册期中质量检测卷(含详解) (二)

2022~2023学年部编版小学四年级语文下册期中质量检测卷(二)一、将下列加点字的音节补充完整。
(4分)j ǐ y uī快捷.脚趾.繁衍.偷窥.h āng l uān余晖.遭殃.效率.深渊.二、看拼音,写字词。
(6分)yōng yǒu1.这种纳米级的物质()有许多新奇的特性。
jì zhù2.秋天到,纺织娘( )住在他们屋前的瓜架上。
mǐn jié3.狗又( )地跑上来,把它的饭吃完。
三、按查字典的要求填空。
(5分)1.“辟”用音序查字法应先查音序,再查音节 ,它是一个结构的字,组词为 ,可添加偏旁为: 字,再组两个词、。
2.“吼”用部首查字法应先查,再查画,“吼”在字典中的解释有:①(猛兽)大声;②发情或情绪激动时大声叫喊;③(风、汽笛、大炮等)发出很大的响声。
“翻腾怒吼”中的”吼”字应取第种解释。
四、在括号里填上合适的词语。
(6分)( )生机 ( )的微风 ( )地盯着( )影像 ( )的回忆 ( )地唱歌( )风光 ( )的慰藉 ( )地变化( )绿菌 ( )的技术 ( )地动着五、选词填空。
(6分)推动推测推理1.这部( )小说的情节真是一波三折,引人入胜。
2.源源不绝的水流( )着水轮发电机,就产生了强大的电流。
3.从那块琥珀,我们可以( )发生在几万年前的故事详细情形。
警戒警告警觉4.足球场上,个别运动员动作粗野,受到裁判的( )。
5.一只鸟儿飞过,或是什么东西响了一声,母鸡立刻( )起来。
6.我大概是一只鸟,充满了( ),不容易停留,所以一直飞。
六、写出下列句子所使用的描写方法。
(填序号)(4分)A.环境描写B.语言描写C.动作描写 D神态描写1.不再胆怯的小白菊,慢慢地抬起它们的头。
( )2.“爸爸,你看!”他快活地叫起来,“这是什么?”( )3.老师看到题后,皱着眉头,习惯地把左手的大拇指放在嘴唇下面来回移动,思考着。
( )4.几场春雨过后,到那里走走,你常常会看见许多鲜嫩的笋,成群地从土里探出头来。
教科版小学科学三年级下册期中综合质量检测卷(二)(含答案)

科教版小学科学三年级下册期中综合质量检测卷(二)一、选择题(20分)1.分别把小立方体块和小球放到坡度相同的斜面上,小立方体块在斜面上是静止,小球放在斜面上却滚了下来。
这说明()会影响物体在斜面上的运动情况。
A.斜面的坡度B.物体的形状C.斜面的宽度2.用盒子给蚕宝宝造“房子”时,下列做法正确的是()。
A.给盒子里喷洒杀虫剂B.盖紧盒盖C.在盒盖上扎些小孔3.下列各种工具中,可以把蚕卵看得更加清楚的是()。
A.放大镜B.小刀C.尺子4.人类繁衍后代的方式是()。
A.卵生B.胎生C.卵胎生5.蚕的一生经历了()。
A.卵、幼虫、蛹三个阶段B.卵、幼虫、蛹、成虫四个阶段C.卵、幼虫、成虫三个阶段6.轮船、汽车、自行车、喷气式客机四种交通工具1小时内通过的距离分别是45千米、120千米、15千米、900千米。
则这四种交通工具的运动速度从大到小排序是()。
A.轮船>汽车>喷气式客机>自行车B.自行车>轮船>汽车>喷气式客机C.喷气式客机>汽车>轮船>自行车7.如图,小红利用方向盘描述位置。
她在方向盘中心的()。
A.东北方向300米B.东南方向C.东南方向400米8.一个重物在地面上被拖着前进时,重物相对于地面()。
A.静止不动B.有时动有时不动C.在运动9.在观察一枚熟鸡蛋的时候,下列做法正确的是()。
A.先把蛋壳敲碎,剥完蛋壳再观察B.先观察鸡蛋外壳,再观察内部结构C.先把鸡蛋切成两半,对内部进行观察10.下面的运动中全是直线运动的是()。
A.抛出去的铅球B.荡秋千C.锯木头二、填空题(12分)11.蚕宝宝最主要的食物是____________。
12.蚕生长到一定阶段,会长出___________,换下___________,这叫___________。
这样做的原因是___________阻碍身体长大。
13.像蚕和鸡这样通过产卵繁殖后代的方式叫做______,它们的幼虫或幼崽从卵中破壳而出,叫__________。
小学数学四年级上册期中考试质量检测卷(二) 人教版(含答案)

期中考试质量检测卷(二)一.选择题(共8小题,满分16分,每小题2分)1.(2分)读8060090时,应读出()个零.A.一B.两C.三D.四2.(2分)在今年庆祝建国70周年阅兵仪式中,受阅官兵总规模约一万五千人.划线的数写作()A.1500B.10500C.15000D.1050003.(2分)如果1平方米能铺4块地砖,1公顷能铺()块地砖.A.40000B.4000C.4004.(2分)16公顷等于()A.160平方米B.1600平方米C.160000平方米5.(2分)下面的图形中,不是角的是()A.B.C.6.(2分)“中国天眼”是世界上最大单口径的射电望远镜,它可以搜索、接收字宙中的信号.宇宙中的天体发射出的信号可以近似看成()A.线段B.射线C.直线D.垂线7.(2分)在计算462×35的时候,4×3表示()A.400×3B.400×30C.40×308.(2分)250×80的末尾有()个0.A.2B.3C.4D.5二.填空题(共8小题,满分16分,每小题2分)9.(2分)算式329×□6,如果积是五位数,□里最小填.10.(2分)两位数乘三位数,交换乘数的位置,用位数乘位数,计算起来比较方便.11.(2分)射线有个端点,射线和都是直线的一部分.12.(2分)小明用量角器量了∠1,∠1是度.13.(2分)截止到2019年11月,北京大兴国际机场拥有航站楼综合体建筑共计1400000平方米,合公顷.14.(2分)6公顷=平方米;10平方千米=公顷.15.(2分)七千零八十写作,2008读作,在8786中,从右边数第二个8在位,表示.16.(2分)截至2019年底,我国大陆总人口为十四亿零五万人.横线上的线写作:,省略“亿”后面的尾数大约是亿人.三.判断题(共4小题,满分8分,每小题2分)17.(2分)6086中,两个6表示的意义相同.(判断对错)18.(2分)一块菜地面积为100平方米,是1公顷.(判断对错)19.(2分)图中没有角.(判断对错)20.(2分)105×83的积比150×38的积小.(判断对错).四.计算题(共3小题,满分15分,每小题5分)21.(5分)用竖式计算.175×13=34×206=127×90=22.(5分)如图,∠1=∠2,图中所有角的和的度数是120°,∠1是多少度?23.(5分)想一想,算一算,再用计算器验证.(1)775+776+777+778+779(2)456+458+460+462+464+466五.应用题(共3小题,满分15分,每小题5分)24.(5分)用1、3、6、9和4个0组成的最大八位数是多少?如果把它扩大到原来的100倍,然后改写成用“亿”作单位的数(保留一位小数),应是多少亿?25.(5分)国庆节到来之际,“中华人民共和国成立70周年”主题花坛亮相全国许多城市.花坛中摆放的五颜六色的花卉来自某种植基地,如果该基地中1平方米的土地能种8株花,那么1公顷的土地能种多少株花?26.(5分)某种溜冰鞋的单价是130元,溜冰城的老板要添24双溜冰鞋,一共需要多少钱?六.操作题(共2小题,满分10分,每小题5分)27.(5分)分别画出一个150°的角和一条4厘米长的线段.28.(5分)连一连.七.解答题(共4小题,满分20分,每小题5分)29.(5分)在〇里填上“>”“<”或“=”.9500平方米〇1公顷50000平方米〇5公顷83000平方米〇8公顷11公顷〇110000平方米30.(5分)分一分,填一填,下面的角分别属于哪一种角.5°,105°,90°,39°,91°,180°,360°31.(5分)一辆自行车的价格是288元,一辆电动车的价格是自行车的13倍.①一辆电动车的价格是多少元?②一辆电动车的价格比一辆自行车贵多少元?32.(5分)读数,写数.期中考试质量检测卷(二)参考答案一.选择题(共8小题,满分16分,每小题2分)1.(2分)读8060090时,应读出()个零.A.一B.两C.三D.四【答案】B【解答】解:8060090读作:八百零六万零九十,即读出8060090时,应读出2个零;故选:B。
人教版数学四年级上册期中检测卷(二)(第1-4单元)(含解析)

期中检测卷(二)时间:90分钟 满分:100分题号一二三四五六总分得分一、填空。
(每空1分,共28分)1.中国开封第36届菊花文化节共布展菊花2787530盆,省略万位后面的尾数约是()万盆;共吸引投资 35342670000元,省略亿位后面的尾数约是( )亿元。
2. 290000 平方米=( )公顷 15公顷=( )平方米47平方千米=( )平方米=( )公顷3.9009009的最高位是( )位,最右边的“9”表示( ),中间的“9”表示( )。
4.由三个百万、八个十万、五个千组成的数是( ),它是( )位数,四舍五入到万位约是( )。
5.一个长方形果园,长125米,宽80米,( )个这样的果园总面积是1平方千米。
6.下面由两个三角尺拼成的角的度数分别是∠1=( ),∠2=( ),∠3=()。
8.小东骑自行车每分钟行 250米,15分钟行了( )米,行1千米需要( )分钟。
9.在括号里填上适当的单位。
(1)北京圆明园的面积约是350( )。
(2)澳门特别行政区的面积约为 33( )。
(3)一块橡皮的占地面积约是6( )。
(4)明明家客厅的面积约是 30( )。
7.两个因数的积是 16,一个因数不变,另一个因数乘 2,积是( );一个因数不变,另一个因数除以4,积是( )。
10.在◯里填上“>”“<”或“=”。
204万◯ 20450000 105×50◯210×30150×50◯30×250 47公顷◯3平方千米二、判断。
(对的画“✔”,错的画“×”)(5分)1.在数位顺序表中,每两个计数单位之间的进率都是10。
( )2.画出的角的两边越短,角的度数越小。
( )3.过一点能画无数条直线。
( )4.在一道乘法算式里,两个因数都乘3,积就乘6。
( )5.一辆汽车5小时行300千米,求这辆汽车每小时行多少千米。
这是求路程的问题。
( )三、选择。
2024版新教材高考英语复习特训卷期中检测卷二

期中检测卷(二)第一部分阅读(共两节,满分50分)第一节(共15小题;每小题2.5分,满分37.5分)阅读下列短文,从每题所给的A、B、C、和D四个选项中选出最佳选项。
AEnjoy amazing 360degree views over London from the London Eye, a rotating (旋转的) observation wheel which is 135 meters high. Spot some of the capital's most famous landmarks, including Big Ben, the Houses of Parliament and Buckingham Palace.How long does it take to go round the London Eye?The gradual rotation in one of the 32 hightech glass cap sules takes approximately 30 minutes and gives you an everchanging view of London. You can skip most of the queues with a fasttrack ticket.Where is the London Eye and how do I get there?The London Eye is located on the South Bank of the River Thames. The nearest tube station is Waterloo, but Charing Cross, Westminster and Embankment are also a short walk away. Several bus routes stop near the London Eye.How to book London Eye tickets?Tickets to the London Eye must be prebooked on the Internet within the prescribed time limit.PricesChild ticket: From £23.00 per ticket.Adult ticket: From £28.00 per ticket.Children under three years old enter free.Opening hoursThe London Eye opening time varies throughout the year. Typically the attraction opens at 10 a.m. and closes between 6 p.m. and 8:30 p.m. Make sure you check it before your visit to get the best experience.Important informationWe encourage you to arrive at the attraction as early as possible, in order to allow more time for security checks. Please note items that CAN and CANNOT said on board.1.What do we know about the London Eye?A.It has fixed opening hours. B.No queuing is needed to take it.C.A ride on it takes about half an hour. D.It lies some distance away from Waterloo.2.What is a must to pay a visit to the London Eye?A.Booking tickets online in advance. B.Taking no items on board.C.Being accompanied by an adult. D.Arriving at the attraction ahead.3.How much should a couple with their son aged 5 and daughter aged 2 pay to visit the London Eye?A.At least £56. B.At least £74.C.At least £79. D.At least £102.BHow does a brilliant teacher get that way? The question of how they developed has as many answers as there are inspired instructors. One example is an original and charming woman who has become one of the best ever at taking disadvantaged students to a new level.Jackson was born in Altoona. Her father was a construction worker. When she was in the eighth grade, her father died. Her principal, Mrs. Brown, said not to worry about schoolwork for a while. That upset her. Her father would not have wanted her to do anything but her best. He always said, “Don't let your first failure be the reason for your next.”Jackson was an accomplished shooting guard in basketball and a star sprinter on the track team, running the quartermile in 57 seconds. She thought she might become a sports broadcaster. She gave no thought to teaching until a friend took her to an introduction to a program, which placed novice instructors in schools full of lowincome children. Jackson liked the idea of giving back, as well as the chance to have some of her student loans forgiven.She is a big sports person, and that is how she connects with lots of kids. She couldn't motivate children until she knew what was bothering or pleasing them. “Students learn from people who love them,” she said. “They will be motivated and inspired to learn if they know deep down that you care about them.” In class she gave basketball tickets to students who were doing their work. At weekly drawings they could win sticky notes, pencils or other small prizes.She helped create afterschool clubs. A tall student said to her, “I'm a baller.I heard you play ball.” There was a basketball league in Paterson, but the s chool didn't have a team. Jackson started one with support from local business executives. The student, Essence Carson, went to Rutgers University, was a firstround draft (运动员选拔制) selection for the WNBA's New York Liberty and now plays for the Connecticut Sun.4.Why did Mrs. Brown's words upset Jackson?A.Her father just passed away. B.She was taught to do her best.C.Her first failure led to another one. D.She was concerned about her grades.5.What is the main idea of Paragraph 3?A.The way Jackson turned teacher. B.The dream job Jackson desired.C.The student loans Jackson owed. D.The athletics Jackson did well in.6.why did Jackson give small prizes to her students in class?A.To connect with them. B.To please or bother them.C.To encourage them to learn. D.To show her love to them.7.What can we infer from the last paragraph?A.Jackson founded a school team in Paterson alone.B.Jackson played in the basketball league in Paterson.C.Jackson selected Essence to play for WNBA's New York Liberty.D.Jackson should take some credit for Essence's professional career.CRussell Warne has spent many hours examining college psychology textbooks. As a professor of psychology at Utah Valley University, he wasn't looking for insight, but for mistakes—and he found plenty. Some of the worst concerned IQ tests.“Themost common inaccuracy I found, by far, was the claim that intelligence tests are biased__against certain groups,” he says. Yet intelligence researchers are at pains to ensure that IQ tests ar e fair and not culturally biased.“Another very common one was the idea that intelligence is difficult to measure.”No wonder IQ tests often cause disagreements. But that simply isn't the case.“Despite the criticism, the intelligence test is one of the mo st reliable tests ever invented,” says Rex Jung at the University of New Mexico. Nevertheless, you shouldn't trust the kind of 10minute test that might pop up in your social media feed.A comprehensive IQ test takes over an hour and is ideally administered by a professional examiner. It is designed to assess precisely those cognitive (认知的) skills that constitute intelligence, so it consists of a series of subtests that cover reasoning, mental processing speed, spatial (空间的) ability and more. Shorter IQ tests, assessing fewer of these skills, can still provide a general indication of someone's mental abilities, however, because of the nature of intelligence, it means that someone who scores highly on one type of cognitive test will also do comparatively well on others.However, particular applications of IQ tests have faced a thorough inspection.A common criticism of using them to select job applicants is that they only measure certain cognitive skills. They don't scientifically measure creativity, for instance. Neither do they measure personality, which tends to make for reliable and hardworking employees—or ability to get on with other people. However, it is rare for examiners to test IQ independently: candidates might be given a personality test too a nd a practical exercise to assess jobrelated skills. They usually also have to name several professionals to judge.8.What does the underlined words “biased against” in Paragraph 1 probably mean?A.Unfamiliar to. B.Irrelevant to.C.Unfavorable for. D.Irresponsible for.9.What does Rex Jung think of the intelligence tests?A.They are inaccurate. B.They are trustworthy.C.They are properly used. D.They are precisely designed.10.What can we infer about IQ tests in the last paragraph?A.They are rarely accepted. B.They are heavily criticized.C.They may still be employed. D.They can motivate creativity.11.What can be the best title of the passage?A.Do IQ tests really work? B.Applications of IQ tests.C.Misinformation in textbooks. D.Can IQ tests shape personality?DScientists say they've developed a system using machine for learning to predict when and where lightning will strike. The research was led by engineers from the École Polytechnique Fédérale de Lausanne in Lausanne, Switz erland.European researchers have estimated that between 6,000 and 24,000 people are killed by lightning worldwide each year. The strikes can also cause power outages, destroy property, damage electrical equipment and start forest fires. For these reasons, climate scientists have long sought to develop methods to predict and control lightning. In the United States and other places, groundbased sensing devices are used to identify strikes as they happen. But, no system has been created to effectively predict lightning.The system tested in the experiments used a combination of data from weather stations and machine learning methods. The researchers developed a prediction model that was trained to recognize weather conditions that were likely to cause lightning.The model was created with data collected over a 12year period from 12 Swiss weather stations in cities and mountain areas. The data related to four main surface conditions: air pressure, air temperature, relative humidity and wind speed.The atmospheric data was placed into a machine learning algorithm (算法), which compared it to records of lightning strikes. Researchers say the algorithm was then able to learn the conditions under which lightning happens.Amirhossein Mostajabi is a PhD student at the institute who led the developmentof the method. He said,“Current systems for gathering such data are slow and complex and require costly collection equipment like radar or satellites.”“Our method uses data that can be obtained from any weather stati on,” Mostajabi said.“This will improve data collection in very remote areas not covered by radar and satellites or in places where communication systems have been cut,” he added.The researchers plan to keep developing the technology in partnership with a European effort that aims to create a lightning protection system. The effort is called the European Laser Lightning Rod Project.12.Why have climate scientists tried to predict and control lightning?A.To collect relative data.B.To reduce the destruction lightning has been causing.C.To create a scientific system.D.To do research in relation to machine learning.13.The four mentioned surface conditions include all of the following EXCEPT ________.A.air pollution B.wind speedC.relative humidity D.air temperature14.What does the underlined word “it” in Paragraph 5 refer to?A.Lightning. B.The system being tested.C.The atmospheric data. D.The machine learning algorithm.15.What can we learn about Mostajabi from the passage?A.He developed the method and the system by himself.B.He thinks the current systems are too slow and simple.C.He is a professor at the Swiss Federal Institute of Technology.D.He believes their system does much better in data collection.第二节(共5小题;每小题2.5分,满分12.5分)根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。
部编版语文四年级上册-期中检测卷(二)(有答案)

期中检测卷(二)时间:90分钟满分:100分第一部分:积累与运用(45分)1.根据语境写词语。
(8分)Jìyì()中,家乡的春天是美丽的。
小河蜿蜒,héchuánɡ()上的éluǎn shí()清晰可见。
岸边就是zhuānɡ jiɑ()地,放眼望去,各种颜色竞相扑入你的眼,那cōng lǜ()的是麦苗,那nèn hónɡ()的是刚绽放的桃花,那黄hūhū()的一片,不用说,就是那mào shènɡ()的油菜花了……2.[易错]下列词语中,加点字的读音有误的一项是()。
(2分) A.震.惊(zhèn)霎.时(shà) B.悲惨.(cǎn)愚昧.(mèi)C.枯萎.(wèi) 倾.斜(qǐng) D.女娲.(wā) 湮.灭(yīn)3.[易错]下列词语中的“奔”与“投奔”的“奔”读音相同的一项是()。
(2分)A.狂奔B.奔跑C.直奔D.奔走4.[易错]下列词语中,没有错别字的一项是()。
(2分) A.笼罩羞涩逐渐 B.选择研穵开募C.横竖拒决葡萄D.既使驾驶调整5.“双喜临门”的“临”的意思与下面哪个词语中“临”的意思相同?()(2分)A.身临其境B.临危受命C.居高临下D.如临大敌6.把下面句子中加点的词语换成另外一个词语,不改变句子原意。
(4分)(1)那些脚巴在墙上相当..牢固。
()(2)远处,几座小山在云雾中若隐若现....。
()(3)宇宙是未知的,我们将继续探索它的奥秘..。
()(4)我觉得外面似乎发生了一些事情——我有这种预感..!() 7.下列选项中,关于动物的家搭配不正确的一项是()。
(2分) A.鸟窝B.牛洞C.猪圈D.虎穴8.下列句子中,关联词语使用有误的一项是()。
(2分) A.蝙蝠不但能在夜里飞行,而且还能捕捉飞蛾和蚊子。
B.虽然江潮还没有来,但是海塘大堤上早已人山人海。
部编人教版小学数学四年级上册期中检测卷(二)(附答案)

期中检测卷(二)一、选择题。
(每题2分,共20分)1.用三个8和两个0组成一个五位数,两个零都读出来的是()A. 88080B. 88008C. 80808D. 800882.一个整数,它的最高位是十亿位.这个数是()位数.A. 八B. 九C. 十D. 十一3.边长为100米的正方形土地的面积是()A. 1公顷B. 10公顷C. 100公顷D. 1000公顷4.7点整时,钟面上时针与分针较小的夹角是()A. 锐角B. 直角C. 钝角D. 平角5.度量一个角,角的一条边对着量角器上“180”的刻度,另一条边对着“120”的刻度,这个角是()度.A. 60B. 120C. 1806.50乘80积的末尾一共有()个0.A. 2B. 3C. 47.437×25的积的最高位是()A. 万位B. 十万位C. 千位8.□98×5的积最接近2000,□里的数字是()A. 3B. 4C. 5D. 69.39×402的计算结果大约是()A. 10000B. 12000C. 16000D. 2000010.读数时,()的0都不读.A. 所有B. 每级中间C. 每级末尾二、填空题。
(每空1分,共31分)11.2007年“五一”黄金周,某市共接待游客466700人次,改写成用“万”作单位的数是________万人次;实现旅游收入一亿七千四百万元,写作________,省略亿位后面的尾数约是________亿元.12.一个十位数,最高位上是7,百万位和百位都是5,其他各数位上都是0,这个数写作________,读作________,这个数最高位是________位.省略亿后面的尾数约是________亿.13.测量城市面积常用________作单位,测量学校占地面积常用________作单位,测量教室的大小常用________作单位.14.面积单位有________、________、________、________、________.15.25平方千米=________公顷=________平方米.16.如图,已知∠1=40°,那么,∠2=________.17.用量角器测量角时,量角器的中心和角的________重合,0刻度线和角的________重合,另一边所指的刻度就是角的大小.18.1234000000里面有________个亿、________个千万和________个百万.19.横线里最大可以填几?________×41<247 29×________<209 85×________<5305________3568≈50万2________5263≈30万34________248≈34万.20.一周角=________平角=________直角。
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期中测试
(时间:90分钟,满分:100分)
一、我会填。
(每空1分,共17分)
1.在-6、3、0、-18、+7中,( )是正数,( )是负数,( )既不是正数,
也不是负数。
2.如果把平均成绩记为0分,+6分表示比平均成绩( ),-4分表示比平均成绩( ),比平均成绩少0.5分记作( )。
3.某商品打八八折,就是按原价的( )%出售,也就是降价( )% 出售。
4.妈妈把1000元钱存入银行一年,年利率为1.50%,到期后妈妈可得到利息( )元。
5.在一张图纸上,用30cm的长度表示实际距离5cm,这张图纸的比例尺为( )。
6.一个圆柱和一个圆锥等底等高,它们的体积相差18dm3,圆锥的体积是( )dm3。
7.一个圆锥的高不变,底面半径扩大到原来的2倍,底面积扩大到原来的( )倍,体积扩大到原来的( )倍。
8.在一个比例中,两个外项的积是0.6,其中一个内项是3,另一个内项是( )。
9.如果4a=5b,那么a∶b=()。
10.如果圆柱的底面积一定,那么体积和高成( )比例关系;如果体积一定,
那么底面积和高成( )比例关系。
二、我会选。
(将正确答案的序号填在括号里)(每题2分,共10分)
1.王叔叔把10000元钱存入银行,这里的“10000元”是( )。
A.本金
B.利息
C.利率
2.纺织厂2月份织布25000米,3月份织布30000米。
3月份比2月份增产( )。
A.二成
B.八成
C.一成二
3.圆的面积与( )成正比例关系。
A.半径
B.圆周率
C.半径的平方
4.表示x和y成反比例关系的式子是( )。
A.y-x=8
B.x=1
8
÷y C.x÷y=8
5.能与4∶3组成比例的是( )。
A.1
6∶1
8
B.3∶4
C.8∶9
三、我会判。
(对的画“√”,错的画“✕”)(每题2分,共10分)
1.利率=本金×利息×存期 ( )
2.圆柱和圆锥都有一条高。
( )
3.气温升高3℃,记作+3℃;降低2℃,则记作2℃。
( )
4.图上距离一定,实际距离和比例尺成反比例关系。
( )
5.圆柱和圆锥的高相等,体积也相等,圆锥底面积是圆柱底面积的3倍。
( )
四、解比例。
(每题3分,共9分)
x 0.4=96 4∶1=x∶18 67
∶3=0.7∶x
五、图形题。
(共18分)
1.求下图的表面积和体积。
(8分)
2.求下图的体积。
(4分)
3.先画出图A按3∶1的比例放大后的图B,再把图B按1∶2的比例缩小,得到图C。
(6分)
六、解决问题。
(36分)
1.百货大楼这个月的营业额是2400万元,缴纳营业税后还剩2280万元,营业税的税率是多少?(6分)
2.在一张旅游图上,用15厘米表示实际距离60千米,这幅旅游图的比例尺是多少?(6分)
3.小兰的身高是1.4米,她的影长是2.1米。
在她身旁有一棵树,测得树的影长是6米,这棵树有多高?(用比例解答)(6分)
4.一堆玉米堆成圆锥形,底面周长是12.56米,高是1.8米。
(1)如果把这些玉米装在内底面半径是2米的圆柱形粮仓里,能装多高?(6分)
(2)如果每立方米玉米重750千克,这些玉米有多少吨?(6分)
(3)某粮食加工厂的玉米收购价格是1520元/吨。
经检测,这些玉米需扣除一成的水份,这些玉米能卖多少钱?(结果保留两位小数)(6分)
参考答案
一、1.3、+7 -6、-18 0
2.多6分少4分-0.5分
3.88 12
4.15
5.6∶1
6.9
7.4 4
8.0.2
9.5∶4
10.正反
二、1.A 2.A 3.C 4.B 5.A
三、1.✕ 2.✕ 3.✕ 4.√ 5.√
四、x
0.4=9
6
4∶1=x∶1
8
解:6x=9×0.4 解:x=4×1
8
x=3.6÷6 x=1
2
x=0.6
6
7
∶3=0.7∶x
解:6
7
x=0.7×3
x=2.1÷6
7
x=2.45
五、1.表面积:3.14×[(6÷2)2-(4÷2)2]=15.7(dm2)
3.14×6×10=188.4(dm2)
3.14×4×10=125.6(dm2)
15.7×2+188.4+125.6=345.4(dm2)
体积:15.7×10=157(dm3)
2.3.14×(8÷2)2×20=1004.8(cm3)
1
3
×3.14×(8÷2)2×6=100.48(cm3)
1004.8+100.48=1105.28(cm3)
3.
六、1.(2400-2280)÷2400×100%=5%
答:营业税的税率是5%。
2.60千米=6000000厘米
15∶6000000=1∶400000
答:这幅旅游图的比例尺是1∶400000。
3.解:设这棵树高x米。
1.4∶
2.1=x∶6x=4
答:这棵树高4米。
4.(1)12.56÷3.14÷2=2(米)
因为2米=2米,所以圆柱和圆锥的底面积相同。
1
×1.8=0.6(米)
3
答:能装0.6米高。
×3.14×22×1.8=7.536(立方米)
(2)1
3
7.536×750=5652(千克)=5.652(吨)
答:这些玉米有5.652吨。
(3)5.652×(1-10%)×1520≈7731.94(元)
答:这些玉米能卖7731.94元。