题目内容
已知
-
=3,求分式
的值.
| 1 |
| a |
| 1 |
| b |
| a-3ab-b |
| 2a+ab-2b |
∵
-
=3,
∴
=3,即a-b=-3ab,
∴原式=
=
=
=-
.
| 1 |
| a |
| 1 |
| b |
∴
| b-a |
| ab |
∴原式=
| (a-b)-3ab |
| 2(a-b)+ab |
=
| (-3ab)-3ab |
| 2(-3ab)+ab |
=
| -6ab |
| 5ab |
=-
| 6 |
| 5 |
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