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