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小升初数学真题，平均数问题，整体难度不大 学浪计划
填空题4：小升初数学真题，平均数问题，整体难度不大 学浪计划 有7个数排成一列，它们的平均数是20，前5个数的平均数是15，后3个数的平均数是30，那么，第五个数等于?
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