题目内容
已知
-
=3,求
的值.
| 1 |
| x |
| 1 |
| y |
| 5x+3xy-5y |
| x-2xy-y |
∵
-
=3,
∴
=3,
∴x-y=-3xy,
,
=
,
=
,
=
.
故答案为
.
| 1 |
| x |
| 1 |
| y |
∴
| y-x |
| xy |
∴x-y=-3xy,
| 5x+3xy-5y |
| x-2xy-y |
=
| 5(x-y)+3xy |
| (x-y)-2xy |
=
| 5×(-3xy)+3xy |
| -3xy-2xy |
=
| 12 |
| 5 |
故答案为
| 12 |
| 5 |
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