3/4×1/5+3/4×2/5+0.75×3/5-3/4
=3/4×(1/5+2/5+3/5-1)
=3/4×(1/5)
=3/20
4分之3×5分之1+4分之3×5分之2+0.75×5分之3-4分之3简便计算
4分之3×5分之1+4分之3×5分之2+0.75×5分之3-4分之3简便计算
数学人气:958 ℃时间:2019-12-08 13:17:07
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