Whendiditbegintorainyesterdayafternoon? Whendiditbegintorainyesterdayafternoon?A.Itdidn,trainatal B.BeforeTomgothom C.Af 分类:公共英语一级 题型:单选题 查看答案
等比数列{an}的前n项和为Sn,若S3+3S2=0,则公比q=_______ 等比数列{an}的前n项和为Sn,若S3+3S2=0,则公比q=_______ 分类:公共英语一级 题型:单选题 查看答案