解方程：（2x-1）2-16=0_爱下问搜题

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问题解答题

解方程：（2x-1）²-16=0

答案

移项得，（2x-1）²=16

开方得，2x-1=±4

当2x-1=4时，x=

5

2

，

当2x-1=-4时，x=-

3

2

．

补全对话，情景问答

给问句找答语。

( ) 1. What day is it today?
( ) 2. What do you do on Sundays?
( ) 3. What's he like?
( ) 4. What do you have for lunch?
( ) 5. What's your favourite food?

A. We have beef.
B. He's tall and strong.
C. I often play football.
D. It's Sunday today.
E. Eggs and Noodles.

单项选择题

进给速率开关，选择（）指定的进给速度百分比，以改变速度。

A.操作者

B.程序

C.机床

D.坐标