题目内容
先化简，后求值：(1+
)÷
，其中x=-4．
| 1 |
| x-1 |
| x |
| x2-1 |
原式=(
+
)×
=
×
=x+1．
当x=-4时，原式=-4+1=-3．
| x-1 |
| x-1 |
| 1 |
| x-1 |
| (x-1)(x+1) |
| x |
=
| x |
| x-1 |
| (x-1)(x+1) |
| x |
=x+1．
当x=-4时，原式=-4+1=-3．
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题目内容
| 1 |
| x-1 |
| x |
| x2-1 |
| x-1 |
| x-1 |
| 1 |
| x-1 |
| (x-1)(x+1) |
| x |
| x |
| x-1 |
| (x-1)(x+1) |
| x |