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