题目内容
计算:(1
-
-
)÷(-
)+(-
).
| 3 |
| 4 |
| 7 |
| 8 |
| 7 |
| 12 |
| 7 |
| 8 |
| 8 |
| 3 |
原式=
×(-
)-
×(-
)-
×(-
)-
=-2+1+
-
=-1-2
=-3.
| 7 |
| 4 |
| 8 |
| 7 |
| 7 |
| 8 |
| 8 |
| 7 |
| 7 |
| 12 |
| 8 |
| 7 |
| 8 |
| 3 |
=-2+1+
| 2 |
| 3 |
| 8 |
| 3 |
=-1-2
=-3.
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