名校课堂周测卷十一(名校课堂数学周测电子版)

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人教版九年级上名校课堂卷子答案数学答案

是这些吗?

名校课堂九年级数学答案

一、选择题

1. (2012四川成都3分)分式方程 的解为【 】

A.x=1 B. x=2 C. x=3 D. x=4

【答案】C。

【考点】解分式方程。

【分析】由 去分母得:3x﹣3=2x,移项得:3x﹣2x=3,合并同类项得:x=3。

检验:把x=3代入最简公分母2x(x﹣1)=12≠0,故x=3是原方程的解。

∴原方程的解为:x=3。故选C。

2. (2012四川成都3分)一件商品的原价是100元,经过两次提价后的价格为121元,如果每次提价的百分率都是x,根据题意,下面列出的方程正确的是【 】

A.100(1+x)=121 B. 100(1-x)=121 C. 100(1+x)2=121 D. 100(1-x)2=121

【答案】C。

【考点】由实际问题抽象出一元二次方程(增长率问题)。

【分析】由于每次提价的百分率都是x,第一次提价后的价格为100(1+x),

第一次提价后的价格为100(1+x) (1+x) =100(1+x)2。据此列出方程:100(1+x)2=121。 故选C。

3. (2012四川攀枝花3分)下列说法中,错误的是【 】

A. 不等式x<2的正整数解中有一个 B. ﹣2是不等式2x﹣1<0的一个解

C. 不等式﹣3x>9的解集是x>﹣3 D. 不等式x<10的整数解有无数个

【答案】C。

【考点】不等式的解集。

【分析】解不等式求得B,C选项的不等式的解集,即可判定C错误,由不等式解的定义,判定B正确,然后由不等式整数解的知识,即可判定A与D正确。故选C。

4. (2012四川攀枝花3分)已知一元二次方程:x2﹣3x﹣1=0的两个根分别是x1、x2,则x12x2+x1x22的值为【 】

A. ﹣3 B. 3 C. ﹣6 D. 6

【答案】A。

【考点】一元二次方程根与系数的关系,求代数式的值。

【分析】由一元二次方程:x2﹣3x﹣1=0的两个根分别是x1、x2,

根据一元二次方程根与系数的关系得,x1+x2=3,x1x2=―1,

∴x12x2+x1x22=x1x2(x1+x2)=(-1)•3=-3。故选A。

5. (2012四川宜宾3分)分式方程 的解为【 】

A. 3 B. ﹣3 C. 无解 D. 3或﹣3

【答案】C。

【考点】解分式方程。

【分析】因为方程最简公分母为:(x+3)(x﹣3)。故方程两边乘以(x+3)(x﹣3),化为整式方程后求解:

方程的两边同乘(x+3)(x﹣3),得12﹣2(x+3)=x﹣3,

解得:x=3.

检验:把x=3代入(x+3)(x﹣3)=0,即x=3不是原分式方程的解。

故原方程无解。

故选C。

6. (2012四川广安3分)已知关于x的一元二次方程(a﹣l)x2﹣2x+l=0有两个不相等的实数根,则a的取值范围是【 】

A.a>2 B.a<2 C.a<2且a≠l D.a<﹣2

【答案】C。

【考点】一元二次方程根的判别式,一元二次方程定义。

【分析】利用一元二次方程根的判别式列不等式,解不等式求出a的取值范围,结合一元二次方程定义作出判断:

∵由△=4﹣4(a﹣1)=8﹣4a>0解得:a<2。

又根据一元二次方程二次顶系数不为0的定义,a﹣1≠0,∴a<2且a≠1。故选C。

7. (2012四川内江3分)甲车行驶30千米与乙车行驶40千米所用时间相同,已知乙车每小时比甲车多行驶15千米,设甲车的速度为 千米/小时,依据题意列方程正确的是【 】

A. B. C. D.

【答案】C。

【考点】由实际问题抽象出方程(行程问题)。

【分析】∵甲车的速度为 千米/小时,则乙甲车的速度为 千米/小时

∴甲车行驶30千米的时间为 ,乙车行驶40千米的时间为 ,

∴根据甲车行驶30千米与乙车行驶40千米所用时间相同得 。故选C。

8. (2012四川达州3分)为保证达万高速公路在2012年底全线顺利通车,某路段规定在若干天内完成修

建任务.已知甲队单独完成这项工程比规定时间多用10天,乙队单独完成这项工程比规定时间多用40天,

如果甲、乙两队合作,可比规定时间提前14天完成任务.若设规定的时间为x天,由题意列出的方程是【 】

A、 B、

C、 D、

【答案】B。

【考点】由实际问题抽象出分式方程(工程问题)。

【分析】设规定的时间为x天.则甲队单独完成这项工程所需时间是(x+10)天,乙队单独完成这项工程所需时间是(x+40)天.甲队单独一天完成这项工程的 ,乙队单独一天完成这项工程的 ,

甲、乙两队合作一天完成这项工程的 ,则 。故选B。

9. (2012四川德阳3分)为确保信息安全,信息需加密传输,发送方由明文→密文(加密);接收方由密文→明文(解密).已知加密规则为:明文a,b,c,d对应密文, , , , .例如:明文1,2,3,4对应的密文5,7,18,16.当接收方收到密文14,9,23,28时,则解密得到的明文为【 】

A. 4,6,1,7 B. 4,1,6,7 C.6,4,1,7 D.1,6,4,7

【答案】C。

【考点】多元一次方程组的应用。

【分析】已知结果(密文),求明文,根据规则,列方程组求解:依题意,得

,解得 。故选C。

10. (2012四川绵阳3分)已知a>b,c≠0,则下列关系一定成立的是【 】。

A.ac>bc B. C.c-a>c-b D.c+a>c+b

【答案】D。

【考点】不等式的性质。

【分析】根据不等式的基本性质进行判断即可:

A、当c<0时,不等式a>b的两边同时乘以负数c,则不等号的方向发生改变,即ac<bc.故本选项错误;

B、当c<0时,不等式a>b的两边同时除以负数c,则不等号的方向发生改变,即 .故本选项错误;

C、在不等式a>b的两边同时乘以负数-1,则不等号的方向发生改变,即-a<-b;然后再在不等式的两边同时加上c,不等号的方向不变,即c-a<c-b.故本选项错误;

D、在不等式a>b的两边同时加上c,不等式仍然成立,即a+c>b+c;故本选项正确。 故选D。

11. (2012四川凉山4分)设a、b、c表示三种不同物体的质量,用天枰称两次,情况如图所示,则这三种物体的质量从小到大排序正确的是【 】

A. B. C. D.

【答案】A。

【考点】等式和不等式的性质。

【分析】观察图形可知:b+c =3c,即b = 2c ;且a>b。所以 。故选A。

12. (2012四川凉山4分)雅西高速公路于2012年4月29日正式通车,西昌到成都全长420千米,一辆小汽车和一辆客车同时从西昌、成都两地相向开出,经过2.5小时相遇,相遇时,小汽车比客车多行驶70千米,设小汽车和客车的平均速度分别为x千米/小时和y千米/小时,则下列方程组正确的是【 】

A. B.

C. D.

【答案】D。

【考点】由实际问题抽象出二元一次方程组(行程问题)。

【分析】设小汽车和客车的平均速度分别为x千米/小时和y千米/小时,

根据相遇时,小汽车比客车多行驶70千米可列方程2.5x-2.5y=70;

根据经过2.5小时相遇,西昌到成都全长420千米可列方程2.5x+2.5y=420。

故选D。

13. (2012四川泸州2分)若关于x的一元二次方程x2 -4x + 2k = 0有两个实数根,则k的取值范围是【 】

A、k≥2 B、k≤2 C、k>-2 D、k<-2

【答案】B。

【考点】一元二次方程根的判别式,解一元一次不等式。

【分析】由于已知方程有两个实数根,根据一元二次方程的根与判别式的关系,建立关于k的不等式,解不等式即可求出k的取值范围:

∵a=1,b=-4,c=2k,且方程有两个实数根,

∴△=b2-4ac=16-8k≥0,解得,k≤2。故选B。

14. (2012四川泸州2分)已知三角形两边的长分别是3和6,第三边的长是方程x2 - 6x + 8 = 0的根,则这个三角形的周长等于【 】

A、13 B、11 C、11 或13 D、12或15

【答案】A。

【考点】因式分解法解一元二次方程,三角形三边关系。

【分析】首先由方程x2-6x+8=0,确定第三边的边长为2或4;其次考查2,3,6或4,3,6能否构成三角形,从而求出三角形的周长:

解方程x2-6x+8=0,得:x1=2或x2=4。

当第三边是2时,2+3<6,不能构成三角形,应舍去;

当第三边是4时,三角形的周长为4+3+6=13。故选A。

15. (2012四川南充3分)方程x(x-2)+x-2=0的解是【 】

(A)2 (B)-2,1 (C)-1 (D)2,-1

【答案】D。

【考点】因式分解法解一元二次方程。

【分析】先利用提公因式因式分解,再化为两个一元一次方程,解方程即可: 由x(x﹣2)+(x-2)=0,得(x-2)(x+1)=0,∴x-2=0或x+1=0, ∴x1=2,x2=-1。故选D。

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八年级上册英语《名校课堂》试卷所有答案

都是我自己的答案。。本人准确率真的不是很高。。而且我数学不是很好。。课堂预习1.B2.(1)a (2)∠a ∠β当堂训练1.C3.m 平分线 点C5.A其它作图的应该都没问题把你。 就这些了。

图在钝角△abc中cd是哪条底上的高你能画出过b点的高吗

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题目内容

如图钝角△ABC,请画出:

(1)AB边上的高CD;

(2)BC边上的中线AE;

(3)∠BAC的角平分线AF;

(4)写出图中相等的线段;

(5)写出图中面积相等的三角形.

试题答案

考点:作图—复杂作图

专题:

分析:(1)根据延长BA,过C作CD⊥AB即可;

(2)找出BC的中点,连接AE即可;

(3)作∠BAF=∠CAF;

(4)根据中线定义可得BE=EC;

(5)根据三角形的中线平分三角形的面积可得答案.

解答:解:(1)(2)(3)如图所示:

(4)AE=EC;

(5)△ABE,△AEC的面积相等.

点评:此题主要考查了复杂作图,关键是掌握三角形的高、中线,角平分线定义.

一题一题找答案解析太慢了

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解方程

(1)-3(x-1)=6;

(2)3(x+1)-2(x+2)=2x+3;

(3)

2x+1

4

-1=x-

10x+1

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某配件厂原计划每天生产60件产品,改进技术后,工作效率提高了20%,这样不仅提前5天完成了生产任务,并且比原计划多生产了48件产品.问:原计划要生产多少件产品?

把下列各式分解因式:

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解方程:(2x+1)(2x-1)+3(x+2)(x-2)=(7x+1)(x-1)

解答题

(1)解不等式组

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(2)解不等式

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≤1,并把它的解集在数轴上表示出来.

一个几何体由几个大小相同的小立方块搭成,从上面观察这个几何体,看到的形状如图所示,其中小正方形中的数字表示在该位置的小立方块的个数.请你画出从正面、左面看到的这个几何体的形状图.

如图,函数y=

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(x>0,k是常数)的图象经过A(1,4),B(m,n),其中m>1.过点B作y轴的垂线,垂足为C,连接AB,AC.若△ABC的面积为4,求点B的坐标.

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名校课堂八年级下册英语答案(2)

八年级下册英语期末测试题

一.单项选择。(1′×10=10分)

1. –What did you do last week? –I ________ for exams and _______ some food in the supermarket.

A. study, buy B. studied, buyed C. studied, bought D. studyed, bought

2. When I came home, I ___________ my father ___________ a newspaper.

A. find, read B. found, reading C. found, reads D. find, reading

3. –___________did you go last Sunday? – I went to the zoo.

A. How B. Where C. When D. Why

4. Peter, remember ___________ your umbrella. It’s raining.

A. to take B. taking C. took D. for taking

5. ___________ in class, please.

A. Not talk B. Not talking C. Don’t talk D. Not to talk

6. My mom asked me ___________ her to do housework.

A. help B. to help C. helping D. help with

7. Those jokes made me ___________ .

A. laughing B. laughed C. laugh D. to laugh

8. Tom Sawyer spent 2 months ___________ his book.

A. on writing B. for writing C. in D. writing

9. –How was your vacation?

–It was ___________ . The food was awful, and the hotel was crowded.

A. not bad B. fantastic C. terrible D. o-so

10. There ___________ some iced tea in the cup.

A. are B. is C. have D. has

11. ---- I don’t know if he ____________ . ---- He will come if it _____________.

A. comes; won’t rain B. will come; doesn’t rain C. comes; doesn’t rain D. will come; won’t rain

12.─ What_________? ─ I want to be an engineer.

A.are you going B.are you going to be C.will you are D.you will be

13.We’ll have _________ free time and _________ work. We’ll be very busy.

A.more; less B.more; fewer C.less; more D.fewer; more

14.I need to get money to pay _________ summer camp.

A.for B.with C.in D.on

15.He doesn’t have any money, _________.

A.too B.also C.either D.neither

二.完形填空。

Mr. Green heard that a certain government department(政府部门)wanted a clerk(职员), 1 he wrote and 2 the position(职位). But while he was waiting for 3 , a friend of his introduced him to the head of the department. And the head at once gave him 4 .

Several months 5 , 6 Mr. Green was working in the department, he got a letter from his old address. This letter said:

“Dear Sir, We are 7 to have to tell you that we cannot offer you the work in this department because we do not think that you would 8 do the job successfully.Yours Faithfully,”

Mr. Green laughed, but when he looked at the letter more 9 he was 10 to see that he signed it himself!

1.A.but B.so C.or D.and

2.A.go ready for B.looked for C.took D.asked for

3.A.an answer B.his friend C.the position D.the head

4.A.the pay B.the address C.the work D.a letter

5.A.later B.ago C.before D.since

6.A.so B.then C.while D.after

7.A.happy B.sorry C.sure D.pleased

8.A.have to B.love to C.be glad to D.be able to

9.A.quietly B.politely C.carefully D.quickly

10.A.worried B.lucky C.sad D.surprised

三.阅读理解。

A

Today almost everyone knows computers and the Internet. If I ask you “What is the most important in your life?” maybe you will say “Computers and the Internet.”

The first computer was made in 1946. it was very big but it worked slowly. Today computers are getting smaller and smaller. But they work faster and faster. What can computers do? A writer has said, “People can’t live without computers today.”

The Internet came a little later than computers. It is about twenty-five years later than computers. But now it can be found almost everywhere. We can use it to read books, writer letters, do shopping, play computer games or make friends.

Many students like the Internet very much. They often go into the Internet as soon as they are free. They make friends on the Internet and maybe they have never seen these friends. They don’t know their real names, ages, and even sex. They are so interested in making the “unreal friends” that they can’t put their hearts into study. Many of them can’t catch up with others on many subjects because of that.

We can use computers and the Internet to learn more about the world. But at the same time, we should remember that not all the things can be done by computers and the Internet.

1. The Internet can not be used for______.

A. studying B. shopping C. thinking D. playing

2. When the computer was invented, it was______.

A. large and worked quickly B. small and worked slowly C. large but worked slowly D. small but worked quickly

3. The Internet was born in about________.

A. 1960 B. 1970 C. 1980 D. 1985

4. Which of the following is TRUE?

A. Few students like going into the Internet. B. Students use the Internet to make “unreal friends.”

C. These “Unreal friends” often meet each other D. Students know the friends on the Internet very well

5. What does the writer think of the Internet?

A. It is wonderful B. It can make students study harder

C. It is not good for students D. It is helpful, but we can’t do everything on it.

B

Until a few years ago, only boys could become students at the university of Ruritania (鲁里坦尼亚大学). Later the university decided to take girls in. But one of the teachers, Mr Goller, was not pleased at all. He had not wanted to let girl students in.

Mr Goller always began his lessons with the word “Gentlemen!” What could he do now? Well, when the girl students came to his lessons for the first time, he still began with the word. For him the girls were just not there. Then one day there was only one boy in his class among a lot of girls. For a moment, Mr Goller didn't know what to do. Then he began, “Sir! ”

Finally a terrible day came when there were no boys in his class He came into the room, looked at the girls and said, “Oh, nobody's here today!” he turned and went out without giving his lessons.

1.Several years ago, ______.

A.there was no girl studying in the university. B.Mr Goller didn't teach in the university

C.the university let girl students in D.most of the students in the university were boys.

2.Mr Goller usually said “______”when he began his lessons.

A.Sir B.Good morning C.Gentlemen D.Hello

3.When the girls came to his lessons, Mr Goller was ______.

A.surprised B.afraid C.glad D.unhappy

4.The writer wants us to know how Mr Goller ______.

A.agreed to let the girls in B.didn't like his teaching

C.always didn't know What to do with the girls D.only liked to teach boy students.

5.We can know from the passage that ______.

A.the boy students didn't enjoy Mr Goller's lessons B.we will not see the girl students in Mr Goller's class.

C.Mr Goller was loved by his students D.Mr Goller will not work in the university.

C

Billy and Sam are twins. They were born on New Year’s Day. Their father Mr. Smith is an English teacher in Sichuan International Studies University. Their mother Mrs. Smith is a bank clerk. They came to China 3 years ago. Billy and Sam are in the same class. Both of them like playing basketball. Billy likes Chinese best. He thinks Chinese is very interesting and popular in the world now. Sam’s favorite subject is P.E because he can learn Taiji in P.E class. They are both very happy. One day their teacher asked the class to write a composition( 作文 )“My Mother”. Sam wrote one, but Billy was lazy. He just copied(抄袭)his brother’s. The next day, the teacher asked Billy why his composition was the same as Sam’s. “We have the same mother, don’t we?”answered Billy.

根据短文内容判断 句子 正误,正确的写T,错误的写F。

( )1. Sam’s birthday was on January 2nd.

( )2. Sam and Billy are in different classes.

( )3. The name of the composition was “My Mother”.

( )4. Billy’s composition was the same as Sam’s.

( )5. Billy was not lazy. He was very clever.

D

I’ll Show You the Way

Pat Hogan was traveling around the country in his car. One evening he was driving along a road and looking for a small hotel, when he saw an old man at the side of the road. He stopped his car and said to the old man, “I want to go the Sun Hotel. Do you know it?”

“Yes,” the old man answered. “ I’ll show you the way.”

He got into Pat’s car, and they drove for about twelve miles. When they came to a small house, the old man said, “ Stop here.”

Pat stopped and looked at the house. “But this isn’t a hotel,” he said to the old man.

“No,” the old man answered, “this is my house. And now I’ll show you the way to the Sun Hotel. Turn around (转身) and go back nine miles.Then you’ll see the Sun Hotel on the left.”

( ) 1. What was Pat looking for?

A. The Sun Hotel. B. The Moon Hotel. C. The Star Hotel. D. His house.

( ) 2. Who did Pat meet?

A. A policeman. B. An old man. C. An old woman. D. A boy.

( )3. Where did the old man take Pat to?

A. The Sun Hotel. B. A supermarket. C. The old man’s house. D. A restaurant.

( ) 4. How far did Pat drive after the old man got on his car?

A. Five miles. B. Twelve miles. C. Three miles. D. Nine miles.

( )5. How far was the hotel from the place Pat saw the old man?

A. Twelve miles. B. Nine miles. C. Three miles. D. Five miles.

四.根据句意用所给词的适当形式填空。

1. Simon said he had a ________(please) journey last week.

2. Every year many______(tour) come to Beijing to visit the Great Wall.

3. We should work hard at English because it’s important in our_________(day) life.

4. A man’s life will lose its________(mean) if he has no interest. Do you agree with me?

5. We all think Jet Lee is a __________(success) actor.

五.句型转换。

1. Amy said, “My favorite food is KFC.”(改为间接引语)

Amy said that_____ favorite food ______ KFC.

2. The writer didn’t write that book.(改为被动语态)

The book______ ______ by the writer.

3. She’s never been late for school since then.(改为反意疑问句)

She’s never been late for school since then, _______ _______?

4. The information is very important.(改为感叹句)

_______ __________ information it is!

5. I felt nervous at the beginning.(对划线部分提问)

______ ______ you_______ at the beginning?

六.用括号内所给单词的适当形式填空,必要时加助动词或情态动词。

Kate’s grandmother is 60 years old. She likes (1) ______(drive) very much and she (2)______(drive) for over 35 years. She doesn’t drive fast these years because she is old. She drives well and never (3)__________(have) an accident.

Sometimes Kate says to her, “Please (4) ________(not drive) your car, I can (5)______ (take) you to the shops in mine.” But she always says, “No, I like driving. I don’t want (6)______ (stop) now.

One day, she (7) ___________ (stop) her car at the traffic lights because they were red. But when the lights (8)________(turn) green, she couldn’t start her car and the lights (9)________(change) on. Just then a policeman (10) _________ (come) and said to her politely, “Do you like to watch the traffic lights?”

七.根据上下文从方框中选出合适的句子完成对话。其中有两句是多余的。

A: Good morning, Miss Smith.

B: Hi, Sandy. Where have you been?

A: (1)_______

B: Really? That’s great! Did you talk with Mark and Judy?

A: Yes, but only a few words. And I’m not sure if they could understand me.

B: No problem. (2)_______

A: But I’m afraid of making mistakes when I speak.

B: (3)_________ You should believe yourself.

A: But do you think they like to talk with us beginners?

B: Yes, unless they’re busy.

A: Well, I’m still not so confident. You know my pronunciation is poor.

B: (4)__________ Try to talk with them as much as you can.

A: All right. (5)________

A. Thanks a lot, Miss Green.

B. I’ve just been to the English corner.

C. That’s a bad excuse.

D. You have made a good start.

E. No, I’m not.

F. We all learn from mistakes, don’t we?

G. Can I help you?

八.作文。(10分)

根据英文提示,以“怎样学好英语”为题写一段小 文章 。要求不少于50词,内容必须包括英文提示中的要点。

谁有名校课堂英语八年级上册单元测试卷答案

Nowadays, as the development of the Internet, people count on the computer so much. They use the computer to communicate with others, scan the instant news or do their work. Internet provides people a large stage to share their opinion. But the problem comes, as the law about the Internet is not that complete, so some people say what that they want, even attack others. They are not afraid, because there is no law can punish them. Internet language sometimes is like another form of violence, the celebrities are easily becoming the targets for people to attack. The small contradiction can be enlarged by the uncivilized words and someone will be criticized by the public. They are under great pressure and people don’t have to undertake it originally. We should watch out our Internet words, never try to hurt others. Remember the moral regulations.

如今,随着网络的发展,人们很依赖电脑。他们使用电脑和别人交流,浏览即时信息或者做他们的工作。网络给人们提供了一个交流意见的大平台。但是问题也来了,由于有关网络的法律还不够完善,因此一些人随心所欲,甚至攻击他人。他们不害怕,因为没有法律可以惩罚他们。网络语言有时候就像另一种方式的暴力,名人很容易就成为人们攻击的目标。小小的矛盾可以被不文明的用语放大,一些人会被大众批评。他们面临很大的压力,然而最初他们不用承受这样的批评。文明应该注意自己的网络用语,永远都不要尝试着去伤害别人。铭记道德的约束。

名校课堂八年级上册英语答案

名校课堂八年级上册英语答案(一)

名校课堂八年级上册英语答案(二)

名校课堂八年级上册英语答案(三)

图片来源:精英家教网

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