题目内容
计算：a
+
-(
-b
)
|
| 4b |
| ||
| 2 |
|
a
+
-(
-b
)
=
+2
-（
-
）
=
+2
-
+
=
+3
．
|
| 4b |
| ||
| 2 |
|
=
| a |
| b |
| 1 |
| 2 |
| a |
| b |
=
| a |
| b |
| 1 |
| 2 |
| a |
| b |
=
| 1 |
| 2 |
| a |
| b |
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| 4b |
| ||
| 2 |
|
|
| 4b |
| ||
| 2 |
|
| a |
| b |
| 1 |
| 2 |
| a |
| b |
| a |
| b |
| 1 |
| 2 |
| a |
| b |
| 1 |
| 2 |
| a |
| b |