题目内容
计算：2
÷(3-1
)-0.8．
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| 2 |
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2
÷(3-1
)-0.8，
=2
÷1
-0.8，
=
×
-0.8，
=
-0.8，
=0.7．
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| 2 |
| 1 |
| 3 |
=2
| 1 |
| 2 |
| 2 |
| 3 |
=
| 5 |
| 2 |
| 3 |
| 5 |
=
| 3 |
| 2 |
=0.7．
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