50本占整个书架的3/5+1/3-1=1/15
50/(3/5+1/3-1)=750本
书架上有两层书,第一层比全部的3/5多50本,第二层是全部的1/3书架上共有多少本?
书架上有两层书,第一层比全部的3/5多50本,第二层是全部的1/3书架上共有多少本?
数学人气:961 ℃时间:2020-01-29 19:02:42
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