“harmonic mean”的概念、定义、翻译、参考文献-科学参考

单词	harmonic mean
释义	harmonic mean [här`män·ik `mēn] ^MATHEMATICS For n positive numbers x₁, x₂, . . ., x_n their harmonic mean is the number n /(1/x₁ + 1/x₂ + . . . + 1/x_n ).
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