计算：
5/12-1/4
=5/12-3/12
=2/12
=1/6
2/3-1/4
=8/12-3/12
=5/12
5/12-1/4
=5/12-3/12
=2/12
=1/6
2/3-1/4
=8/12-3/12
=5/12
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第1个回答 2016-09-28
1/6 ，5/12
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