师傅和徒弟的工作效率比是5∶4,全部零件为单位1,师傅完成5／9,徒弟完成4／9
20÷﹙5／9－4／9﹚×5／9
＝180×5／9
＝100个
师傅加工了100个.
师徒俩共同加工一种零件,师徒工作效率比是5：4,若干小时后师傅比徒弟多加工20个,师父加工了多少个零件?
师徒俩共同加工一种零件,师徒工作效率比是5：4,若干小时后师傅比徒弟多加工20个,师父加工了多少个零件?
数学人气：846 ℃时间：2019-08-22 19:45:00
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