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