题目内容
| 4 |
| x2-1 |
| x+1 |
| x-1 |
原式=
-
=
=-
．
| 4 |
| (x+1)(x-1) |
| (x+1)2 |
| (x+1)(x-1) |
=
| -(x-1)(x+3) |
| (x+1)(x-1) |
=-
| x+3 |
| x+1 |
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题目内容
| 4 |
| x2-1 |
| x+1 |
| x-1 |
| 4 |
| (x+1)(x-1) |
| (x+1)2 |
| (x+1)(x-1) |
| -(x-1)(x+3) |
| (x+1)(x-1) |
| x+3 |
| x+1 |