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