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小学数学 六年级 工程问题 三个工程队一起修路 巧妙拆分工作量
小升初工程问题：一条公路，甲队独修24天可以完成，乙队独修30天可以完成。先由甲、乙两队合修4天，再由丙队参加一起修7天后全部完成。如果由丙队独自修这条公路，几天可以完成？
小升初数学名校真题解析——应用题21/80
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