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一列火车从甲地开往乙地返回时，速度提高，结果提前1小时到达甲地．甲、乙两地相距440千米，求这列火车的往返平均速度．
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教案备课库《2016-2017学年新人教版六年级（上）质检数学试卷（2）》真题及答案
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