题目内容
已知
-
=3,则
的值是______.
| 1 |
| a |
| 1 |
| b |
| a-ab-b |
| 2a+ab-2b |
∵
-
=3,
∴
=3,即a-b=-3ab,
原式=
=
=
=
=
.
故答案为:
.
| 1 |
| a |
| 1 |
| b |
∴
| -(a-b) |
| ab |
原式=
| a-ab-b |
| 2a+ab-2b |
=
| (a-b)-ab |
| 2(a-b)+ab |
=
| -3ab-ab |
| -6ab+ab |
=
| -4ab |
| -5ab |
=
| 4 |
| 5 |
故答案为:
| 4 |
| 5 |
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