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2017-02-20
展开全部
2/3-1/6
=4/6-1/6
=1/2
5-1/2
=9/2
3/8+3/20
=15/40+6/40
=21/40
8/9-3/4
=32/36-27/36
=5/36
=4/6-1/6
=1/2
5-1/2
=9/2
3/8+3/20
=15/40+6/40
=21/40
8/9-3/4
=32/36-27/36
=5/36
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