调和平均数
harmonic mean The reciprocal of the arithmetic mean of the reciprocals of a set of positive numbers, i.e., $\frac{n}{\frac{1}{a_1} + \frac{1}{a_2} + \cdots + \f
CSCA 数学 考试术语
harmonic mean The reciprocal of the arithmetic mean of the reciprocals of a set of positive numbers, i.e., $\frac{n}{\frac{1}{a_1} + \frac{1}{a_2} + \cdots + \f
CSCA 数学 考试术语