一项工程 甲队单独完成需要20天,乙要30天,合作完成几分之几
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![一项工程 甲队单独完成需要20天,乙要30天,合作完成几分之几](/uploads/image/z/1538703-63-3.jpg?t=%E4%B8%80%E9%A1%B9%E5%B7%A5%E7%A8%8B+%E7%94%B2%E9%98%9F%E5%8D%95%E7%8B%AC%E5%AE%8C%E6%88%90%E9%9C%80%E8%A6%8120%E5%A4%A9%2C%E4%B9%99%E8%A6%8130%E5%A4%A9%2C%E5%90%88%E4%BD%9C%E5%AE%8C%E6%88%90%E5%87%A0%E5%88%86%E4%B9%8B%E5%87%A0)
一项工程 甲队单独完成需要20天,乙要30天,合作完成几分之几
一项工程 甲队单独完成需要20天,乙要30天,合作完成几分之几
一项工程 甲队单独完成需要20天,乙要30天,合作完成几分之几
1/20+1/30=5/60=1/12
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