题目内容
计算：4
-(-9
)-7
-1
．
| 2 |
| 5 |
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 4 |
4
-（-9
）-7
-1
，
=4
+9
-7
-1
，
=14-9，
=5．
| 2 |
| 5 |
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 4 |
=4
| 2 |
| 5 |
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 4 |
=14-9，
=5．
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