题目内容
化简(
+
)÷
的结果是______．
| x2-1 |
| x2-2x+1 |
| 1-x |
| x+1 |
| x |
| x-1 |
原式=[
-
]•
=
-
=
=
=
．
故答案为：
．
| (x+1)(x-1) |
| (x-1)2 |
| x-1 |
| x+1 |
| x-1 |
| x |
=
| x+1 |
| x |
| (x-1)2 |
| x(x+1) |
=
| (x+1)2-(x-1)2 |
| x(x+1) |
=
| 4x |
| x(x+1) |
=
| 4 |
| x+1 |
故答案为：
| 4 |
| x+1 |
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