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师徒合作一家工作20天完,徒弟先做8天,剩下有师傅做26天完,师傅单独做几天完
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人气:444 ℃ 时间:2020-06-02 06:01:03
解答
师傅效率=(1-8/20)÷(26-8)=1/30
师傅单独=1÷1/30=30天
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