题目内容
先化简，再求值：(
-
)÷
，其中x=
-1．
| x2 |
| x-1 |
| 2x |
| 1-x |
| x |
| x-1 |
| 3 |
(
-
)÷
=（
+
）•
=
•
=
•
=x-2
当x=
-1时，原式=（
-1）-2=
-3．
| x2 |
| x-1 |
| 2x |
| 1-x |
| x |
| x-1 |
=（
| x2 |
| x-1 |
| 2x |
| x-1 |
| x-1 |
| x |
=
| x2-2x |
| x-1 |
| x-1 |
| x |
=
| x(x-2) |
| x-1 |
| x-1 |
| x |
=x-2
当x=
| 3 |
| 3 |
| 3 |
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