上层63,下层45
设下层是x本,则上层为1.4x,x+1.4x=108,
小明的书房有一个两层书架,一共108本.上层放书的本数是下层的1.4倍.两层各摆多
小明的书房有一个两层书架,一共108本.上层放书的本数是下层的1.4倍.两层各摆多
数学人气:153 ℃时间:2020-02-03 15:41:28
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