题目内容
先化简,再求值:(1-
)÷
,其中x=-
.
| 1 |
| x+1 |
| x |
| x2-1 |
| 3 |
| 2 |
原式=
•
=x-1,
当x=-
时,原式=-
-1=-
.
| x |
| x+1 |
| (x+1)(x-1) |
| x |
当x=-
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
| 2 |
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题目内容
| 1 |
| x+1 |
| x |
| x2-1 |
| 3 |
| 2 |
| x |
| x+1 |
| (x+1)(x-1) |
| x |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
| 2 |