题目内容
先化简,再求值:(1+
)÷
,其中x=
-1.
| 1 |
| x-2 |
| x2-1 |
| 2x-4 |
| 2 |
原式=
.
=
;
当x=
-1时,
原式=
=
.
| x-1 |
| x-2 |
| 2(x-2) |
| (x+1)(x-1) |
| 2 |
| x+1 |
当x=
| 2 |
原式=
| 2 | ||
|
| 2 |
练习册系列答案
相关题目
题目内容
| 1 |
| x-2 |
| x2-1 |
| 2x-4 |
| 2 |
| x-1 |
| x-2 |
| 2(x-2) |
| (x+1)(x-1) |
| 2 |
| x+1 |
| 2 |
| 2 | ||
|
| 2 |