等比数列的求和公式
summation formula for a geometric sequence When $q \neq 1$, the sum of the first $n$ terms is $S_n = \frac{a_1(1 - q^n)}{1 - q}$.
CSCA 数学 考试术语
summation formula for a geometric sequence When $q \neq 1$, the sum of the first $n$ terms is $S_n = \frac{a_1(1 - q^n)}{1 - q}$.
CSCA 数学 考试术语