502 Bad Gateway
502 Bad Gateway
nginx/1.4.7502 Bad Gateway
502 Bad Gateway
nginx/1.4.7502 Bad Gateway
502 Bad Gateway
nginx/1.4.7已知数列{an}是首项与公比均为的等比数列,数列{bn}的前n项和n=12(n2+n),n∈N*.(1)求数列{an}与数列{bn}的通项公式;(2)设{anbn}的前n项和为Sn,求证:n<34.☆☆☆☆☆推荐试卷
解析质量好解析质量中解析质量差}