题目内容
计算：(
+
)÷
=______．
| 1 |
| x-1 |
| 1 |
| x+1 |
| 3x |
| 1-x2 |
原式=[
+
]•
=
•
=-
．
故答案是：-
．
| x+1 |
| (x-1)(x+1) |
| x-1 |
| (x-1)(x+1) |
| (1-x)(1+x) |
| 3x |
=
| 2x |
| (x-1)(x+1) |
| (1-x)(1+x) |
| 3x |
=-
| 2 |
| 3 |
故答案是：-
| 2 |
| 3 |
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