摘要: geometric series defination: multiply each term by a fixed numer to get the next term(等比) summation: $$S_n=\frac{a(1-r^n)}{1-r}$$ here\(S_n\) is the s 阅读全文
posted @ 2025-09-02 19:18 Emi-lia 阅读(17) 评论(0) 推荐(0)