题目内容
先化简,再求值:
÷(x-
),其中x=2,y=-1.
| x-y |
| x |
| 2xy-y2 |
| x |
| x-y |
| x |
| 2xy-y2 |
| x |
=
| x-y |
| x |
| x |
| x2-2xy+y2 |
=
| x-y |
| x |
| x |
| (x-y)2 |
=
| 1 |
| x-y |
当x=2,y=-1时,原式=
| 1 |
| x-y |
| 1 |
| 3 |
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题目内容
| x-y |
| x |
| 2xy-y2 |
| x |
| x-y |
| x |
| 2xy-y2 |
| x |
| x-y |
| x |
| x |
| x2-2xy+y2 |
| x-y |
| x |
| x |
| (x-y)2 |
| 1 |
| x-y |
| 1 |
| x-y |
| 1 |
| 3 |