等差中项
arithmetic mean If $a$, $A$, $b$ form an arithmetic sequence, then $A$ is the arithmetic mean of $a$ and $b$, and $A = \frac{a+b}{2}$.
CSCA 数学 考试术语
arithmetic mean If $a$, $A$, $b$ form an arithmetic sequence, then $A$ is the arithmetic mean of $a$ and $b$, and $A = \frac{a+b}{2}$.
CSCA 数学 考试术语