题目内容
| x-y |
| x+2y |
| 2(x-y) |
| x+2y |
| x+2y |
| 3(x-y) |
已知
=3，则
=
，
则原式=2×3-
×
=6-
=5
．
故答案为：5
．
| x-y |
| x+2y |
| x+2y |
| x-y |
| 1 |
| 3 |
则原式=2×3-
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 9 |
| 8 |
| 9 |
故答案为：5
| 8 |
| 9 |
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题目内容
| x-y |
| x+2y |
| 2(x-y) |
| x+2y |
| x+2y |
| 3(x-y) |
| x-y |
| x+2y |
| x+2y |
| x-y |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |