arithmetic mean
... aridity干燥〔度〕 arithmetic mean算术平均;等差中项;算术中项 arithmetic progression等差级数;算术级数 ...
[数] arithmetical mean
... 等差序列 arithmetic sequence 等差中项 arithmetical mean 等度分解 equidecomposition ...
arithmetic mean
若a,b,c三个数按这个顺序排列成等差数列,那么b叫a,c的等差中项, a, b, c满足b-a=c-b a,b,c成等差数列的充分必要条件是b=(a+c)/2.b为等差中项(arithmetic mean)。