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