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51问答网 > 大家帮忙做一下这道数学题，要过程！

大家帮忙做一下这道数学题，要过程！

2025-04-07 03:26:03

推荐回答（3个）

回答1：

1\20+1\15= 7\60 每天可以完成7\60
设：x天完成
（1\20+1\15）x=1 解：x=60\7 答：60\7天可以完成
应该对吧

回答2：

(3/4)/(1/20+1/15)=45/7天是在3/4时

回答3：

甲每天完成1/20，乙每天完成1/15，合作每天完成（1/20+1/15）=7/60，需要60/7约9天

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