甲、乙两城相距126千米.
甲、乙两城相距126千米.一辆货车从甲开往乙城,用2小时,比返回甲城少用了0.5小时.这辆车往返甲乙两城平均每小时行多少千米?
人气:436 ℃ 时间:2020-02-04 21:07:55
解答
126*2/(2+2.5)=56
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