铺铁轨:平均每3米铁轨铺5根枕木,铺4.5千米长的铁轨需要多少根枕木?
人气:231 ℃ 时间:2020-02-03 03:02:04
解答
4.5千米=4500米
4500÷(3÷5),
=4500÷0.6,
=7500(根);
答:铺4.5千米长的铁轨需要7500根枕木.
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