Running at their respective constant rates,machine X takes 2

学习时间:2026-03-30 19:14:25 阅读：3067

Running at their respective constant rates,machine X takes 2 days longer to produce w widgets than machine Y.At these rates,if the two machines together produce 5/4 w widgets in 3 days,how many days would it take machine X alone to produce 2w widgets?A.\x054B.\x056C.\x058D.\x0510E.\x0512

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2026-03-30 19:14:25

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设x用了x天做w个 y用了x-2天则x一天做w\x,y一天w\（x-2）3天x,y一起做了3（w\x+w\（x-2））=5\4w解方程约掉w12\x+12\（x-2）=5化为整式方程得到（5x-4）（x-6）=0x1=0。8 x2=6检验两个都符合原方程但是x1不符合实际所以x为6所以x做2w用12天选e 求采纳爪机打字不容易

Running at their respective constant rates,machine X takes 2

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