（1）3x+5=5x-7（2）x-10x+16=2x+14-1．

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问题解答题

（1）3x+5=5x-7
（2）x-

10x+1

2x+1

-1．

答案

（1）移项得3x-5x=-7-5，

合并得-2x=-12，

系数化为1得x=6；

（2）去分母得12x-2（10x+1）=3（2x+1）-12，

去括号得12x-20x-2=6x+3-12，

移项得12x-20x-6x=3-12+2，

合并得-14x=-7，

系数化为1得x=

．

句型转换

句型转换。

1. The boy used to like running. (改为否定句)

The boy _____ _____ to like running.

2.My father used to read books after supper last year. (改为一般疑问句)

_____ your father _____ _____ _____ books after supper last year?

3. My father stopped working in the factory when he was fifty-five years old. (改为同义句)

My father _____ _____ working in the factory when he was fifty －five years old.

4.It took me three hours to do my homework last Sunday. (改为同义句)

I _____ two hours _____ my homework last Sunday.

5.1 used to go to sleep with my bedroom light on. (对画线部分提问)

_____ _____ you use to go to sleep?

单项选择题

压力愈高，水之沸点是（）

A.降低

B.升高

C.不变

D.无关