分数,要地等式要有通分过程.7/10-3/8-1/8.4/15+5/6.1/2-(3/4-3/8).5/6-(1/3+3/10)
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7/10-3/8-1/8.
=7/10-(3/8+1/8)
=7/10-1/2
=7/10-5/10
=2/10
=1/5
4/15+5/6.
=8/30+25/30
=33/30
=11/10
1/2-(3/4-3/8).
=1/2-(6/8-3/8)
=4/8-3/8
=1/8
5/6-(1/3+3/10)
=5/6-(10/30+9/30)
=25/30-19/30
=6/30
=1/5
=7/10-(3/8+1/8)
=7/10-1/2
=7/10-5/10
=2/10
=1/5
4/15+5/6.
=8/30+25/30
=33/30
=11/10
1/2-(3/4-3/8).
=1/2-(6/8-3/8)
=4/8-3/8
=1/8
5/6-(1/3+3/10)
=5/6-(10/30+9/30)
=25/30-19/30
=6/30
=1/5
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