问题 解答题
某游泳池有水4000m3,先放水清洗池子.同时,工作人员记录放水的时间x(单位:分钟)与池内水量y(单位:m3) 的对应变化的情况,如下表:
时间x(分钟)

10
20
30
40

水量y(m3

3750
3500
3250
3000

(1)根据上表提供的信息,当放水到第80分钟时,池内有水多少m3
(2)请你用函数解析式表示y与x的关系,并写出自变量x的取值范围.
答案

解:(1)由图表可知,每10分钟放水250m3

∴第80分钟时,池内有水4000﹣8×250=2000m3

(2)设函数关系式为y=kx+b,

∵x=20时,y=3500;x=40时,y=3000,

,解得

∴y=﹣25x +4000。

将(10,3750),(30,3250)代入,适合。

∴函数关系式为y=﹣250 x +4000(0≤x≤160)

题目分析:(1)观察不难发现,每10分钟放水250m3,然后根据此规律求解即可。

(2)设函数关系式为y=kx+b,然后取两组数,利用待定系数法一次函数解析式求解即可。

阅读理解

阅读理解。

     William Shakespeare,the great English writer of drama (戏剧),was born in 1564 in

 Stratford-on-Avon.We do not know e verything about Shakespeare's early life.But we know

that he is useful at the Grammar School in Stratford,and that he became interested in the theatre when

he was still a boy. In l586, Shakespeare went to London,where he worked in a theatre for some years

before he beganto write his own plays.Shakespeare soon became well known in London.Every play he

wrote was very glad and new to the people of the capital.Queen Elizabeth liked Shakespeare's plays.

By the end of the l6th century, Shakespeare and his friends had enough money to build their own theatre.

But we must think that Shakespeare had no difficulties in his life.Some writers were against him because

their plays were worse than his.

1. Shakespeare is _______ in England.

A. a scientist        

B. an inventor      

C. a play writer      

D. a story writer

2. The writer thinks ____________.

A. we don't know Shakespeare's boyhood at all

B. we know Shakespeare's childhood a little

C. we know Shakespeare's boyhood a lot

D. we should know Shakespeare about his early life well

3. Shakespeare worked in the theatre ________.

A. when he started to write his plays    

B. after he left the Grammar School

C. when he was twenty-two years old    

D. after he liked the theatre very much

4. Some writers were against Shakespeare because _____.

A. they hated him                  

B. their plays were less famous than his

C. they wrote fewer plays than he    

D. their money was less than his

5. Which of the following sentences is right?

A. Each play Shakespeare wrote was liked by Queen Elizabeth.

B. Shakespeare and his friends built a theatre with their money at the age of thirty.

C. Shakespeare had a happy time and no difficulties in his life.

D. Shakespeare was very popular with the people in London.

单项选择题