题目内容
计算：(
-
)÷
．
| x+2 |
| x |
| x-1 |
| x-2 |
| x-4 |
| x |
(
-
)÷
=
×
=
．
| x+2 |
| x |
| x-1 |
| x-2 |
| x-4 |
| x |
=
| (x+2)(x-2)-x(x-1) |
| x(x-2) |
| x |
| x-4 |
=
| 1 |
| x-2 |
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