题目内容
先化简,后求值:
,其中x=
-2.
| x2-4x+4 |
| x2-4 |
| 2 |
原式=
=
,
当x=
-2时,原式=
=
=1-2
.
| (x-2)2 |
| (x+2)(x-2) |
| x-2 |
| x+2 |
当x=
| 2 |
| ||
|
| ||
|
| 2 |
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题目内容
| x2-4x+4 |
| x2-4 |
| 2 |
| (x-2)2 |
| (x+2)(x-2) |
| x-2 |
| x+2 |
| 2 |
| ||
|
| ||
|
| 2 |