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1、把200千米的水引到都市中來,這個任務交給了甲,乙兩個施工隊,工期50天,甲,乙兩隊合作了30天后,乙隊因另有任務需離開10天,於是甲隊加快速度,每天多修0.6千米,10天后乙隊回來,為了保證工期,甲隊速度不變,乙隊每天比…
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