修一条公路,甲队单独修要15天,乙队单独修要l2天,甲队先修6天后,剩下的由甲、乙两队合修,甲、乙两队合修还要几天?
人气:220 ℃ 时间:2019-08-17 18:29:11
解答
(1-
×6)÷(
+
)
=(1-
)÷
=
×
=4(天)
答:甲、乙两队合修还要4天.
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