题目内容
已知
-
=3，求分式
的值．
| 1 |
| x |
| 1 |
| y |
| 2x+3xy-2y |
| x-2xy-y |
∵
-
=3
∴y-x=3xy
∴x-y=-3xy
∴
=
=
=
=
．
| 1 |
| x |
| 1 |
| y |
∴y-x=3xy
∴x-y=-3xy
∴
| 2x+3xy-2y |
| x-2xy-y |
| 2(x-y)+3xy |
| (x-y)-2xy |
| 2×(-3xy)+3xy |
| -3xy-2xy |
| -3xy |
| -5xy |
| 3 |
| 5 |
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