题目内容
已知
-
=3,则
的值为______.
| 1 |
| x |
| 1 |
| y |
| 2x-2y+xy |
| x-2xy-y |
∵
-
=3,
∴
=3,即x-y=-3xy,
∴原式=
=
=
=1.
故答案为:1.
| 1 |
| x |
| 1 |
| y |
∴
| y-x |
| xy |
∴原式=
| 2(x-y)+xy |
| (x-y)-2xy |
| -6xy+xy |
| -3xy-2xy |
| -5xy |
| -5xy |
故答案为:1.
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