2020-06-30 · 知道合伙人教育行家
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13/15-(8/15+1/3)
=13/15-8/15-1/3
=1/3-1/3
=0
8/9-7/12+1/4
=11/36+1/4
=5/9
13/15-1/2+2/15-1/4
=(13/15+2/15)-(1/2+1/4)
=1-3/4
=1/4
1/3+(1/4+2/5)
=1/3+13/20
=59/60
=13/15-8/15-1/3
=1/3-1/3
=0
8/9-7/12+1/4
=11/36+1/4
=5/9
13/15-1/2+2/15-1/4
=(13/15+2/15)-(1/2+1/4)
=1-3/4
=1/4
1/3+(1/4+2/5)
=1/3+13/20
=59/60
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