如题所述
10分之7-(4分之3-5分之2)能简便要简便
解:根据约分的运用,
原式=7/10-(3/4-2/5)
=7/10-(15/20-8/20)
=14/20-7/20
=7/20
解:根据约分的运用,
原式=7/10-(3/4-2/5)
=7/10-(15/20-8/20)
=14/20-7/20
=7/20
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第1个回答 2017-06-20
原式=7/10+2/5-3/4
=7/10+4/10-3/4
=1-3/4+1/10
=1/4+1/10
=5/20+2/20
=7/20
=7/10+4/10-3/4
=1-3/4+1/10
=1/4+1/10
=5/20+2/20
=7/20