题目内容
计算：-
+(
-
)=______．
| 3 |
| 2 |
| a |
| a |
| 3 |
| 2 |
| b |
原式=-
+
-
=-
-
．
故答案为：-
-
．
| 3 |
| 2 |
| a |
| a |
| 3 |
| 2 |
| b |
| 1 |
| 2 |
| a |
| 3 |
| 2 |
| b |
故答案为：-
| 1 |
| 2 |
| a |
| 3 |
| 2 |
| b |
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