1/(1/8+1/6)=4.8天
甲乙合作4.8天可以完成
一项工程,甲独做8天完成,乙独做6天完成,甲乙合作几天可以完成?
一项工程,甲独做8天完成,乙独做6天完成,甲乙合作几天可以完成?
数学人气:544 ℃时间:2020-03-17 04:16:46
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