题目内容
先化简，再求值：(
+
)÷
，其中x=-2．
| x-1 |
| x2-1 |
| 1 |
| x+1 |
| 4 |
| x2+x |
原式=
÷
=
×
=
，
当x=-2时，原式=-
=-1．
| 2 |
| x+1 |
| 4 |
| x(x+1) |
=
| 2 |
| x+1 |
| x(x+1) |
| 4 |
=
| x |
| 2 |
当x=-2时，原式=-
| 2 |
| 2 |
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题目内容
| x-1 |
| x2-1 |
| 1 |
| x+1 |
| 4 |
| x2+x |
| 2 |
| x+1 |
| 4 |
| x(x+1) |
| 2 |
| x+1 |
| x(x+1) |
| 4 |
| x |
| 2 |
| 2 |
| 2 |