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The harmonic mean of two positive numbers is the reciprocal of the average (arithmetic mean) of their reciprocals. The harmonic mean of 10 and 20 is closest to which of the following?
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· 相关考点
2.1.2 分数运算应用题
2.1.2 分数运算应用题
以上解析由 考满分老师提供。
