题目内容
化简求值：(
-
)÷
，其中x=
．
| x2 |
| x-1 |
| 2x |
| x-1 |
| x |
| x-1 |
| 1 |
| 2 |
(
-
)÷
=
•
=x-2，
把x=
代入上式，x-2=
-2=-1
．
| x2 |
| x-1 |
| 2x |
| x-1 |
| x |
| x-1 |
=
| x(x-2) |
| x-1 |
| x-1 |
| x |
=x-2，
把x=
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
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