题目内容
4
+(2
-
)．
| 1 |
| 2 |
| 3 |
| 4 |
| 1 |
| 2 |
4
+(2
-
)，
=4
-
+2
，
=4+2
，
=6
．
| 1 |
| 2 |
| 3 |
| 4 |
| 1 |
| 2 |
=4
| 1 |
| 2 |
| 1 |
| 2 |
| 3 |
| 4 |
=4+2
| 3 |
| 4 |
=6
| 3 |
| 4 |
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