1/8+2/15+7/30简便5/6+3/4-1/3简便11/12-(1/6+1/8)简便？ 10
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1/8+2/15+7/30
=1/8+(2/15+7/30)
=1/8+(4/30+7/30)
=1/8+11/30
=15/120+44/120
=59/120
5/6+3/4-1/3
=5/6-1/3+3/4
=5/6-2/6+3/4
=3/6+3/4
=1/2+3/4
=2/4+3/4
=5/4
11/12-(1/6+1/8)
=11/12-1/6-1/8
=11/12-2/12-1/8
=9/12-1/8
=3/4-1/8
=6/8-1/8
=5/8
=1/8+(2/15+7/30)
=1/8+(4/30+7/30)
=1/8+11/30
=15/120+44/120
=59/120
5/6+3/4-1/3
=5/6-1/3+3/4
=5/6-2/6+3/4
=3/6+3/4
=1/2+3/4
=2/4+3/4
=5/4
11/12-(1/6+1/8)
=11/12-1/6-1/8
=11/12-2/12-1/8
=9/12-1/8
=3/4-1/8
=6/8-1/8
=5/8
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