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