题目内容
计算：[1-(0.5)-2 ]÷(-
)
．
| 27 |
| 8 |
| 1 |
| 3 |
原式=（1-
）÷[-(
)]
=（-3）÷[-(
)3]
=3×
=2．
| 1 |
| 0.52 |
| 27 |
| 8 |
| 1 |
| 3 |
=（-3）÷[-(
| 3 |
| 2 |
| 1 |
| 3 |
=3×
| 2 |
| 3 |
=2．
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| 27 |
| 8 |
| 1 |
| 3 |
| 1 |
| 0.52 |
| 27 |
| 8 |
| 1 |
| 3 |
| 3 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
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