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