题目内容
先化简，再求值：
÷(x+1-
)，其中x=-1．
| x-2 |
| x-1 |
| 3 |
| x-1 |
原式=
÷
=
•
=
；
当x=-1时，原式=1．
| x-2 |
| x-1 |
| x2-1-3 |
| x-1 |
=
| x-2 |
| x-1 |
| x-1 |
| (x+2)(x-2) |
=
| 1 |
| x+2 |
当x=-1时，原式=1．
练习册系列答案
相关题目
题目内容
| x-2 |
| x-1 |
| 3 |
| x-1 |
| x-2 |
| x-1 |
| x2-1-3 |
| x-1 |
| x-2 |
| x-1 |
| x-1 |
| (x+2)(x-2) |
| 1 |
| x+2 |