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The harmonic mean of x and y is the reciprocal of the average of the reciprocal of x and of y. What is the harmonic mean of 10 and 20?
Give your answer as a fraction.
Give your answer as a fraction.
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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。
