题目内容
化简：(
-
)÷(
-1)=______．
| a-1 |
| a2-4a+4 |
| a+2 |
| a2-2a |
| 4 |
| a |
(
-
)÷(
-1)
=[
-
]÷
=
•
=
•
=
．
故答案为：
．
| a-1 |
| a2-4a+4 |
| a+2 |
| a2-2a |
| 4 |
| a |
=[
| a-1 |
| (a-2)2 |
| a+2 |
| a(a-2) |
| 4-a |
| a |
=
| a(a-1)-(a+2)(a-2) |
| a(a-2)2 |
| a |
| 4-a |
=
| 4-a |
| a(a-2)2 |
| a |
| 4-a |
=
| 1 |
| (a-2)2 |
故答案为：
| 1 |
| (a-2)2 |
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