设等比数列{an}的公比为q,前n项和为Sn,若Sn+1,Sn,Sn+2成等差数列,则公比q为[]A.-2B.1C.-2或1D.2或-1-高二数学

题目简介

设等比数列{an}的公比为q,前n项和为Sn,若Sn+1,Sn,Sn+2成等差数列,则公比q为[]A.-2B.1C.-2或1D.2或-1-高二数学

题目详情

设等比数列{an}的公比为q,前n项和为Sn,若Sn+1,Sn,Sn+2成等差数列,则公比q为

A.-2
B.1
C.-2或1
D.2或-1
题型:单选题难度:中档来源:同步题

答案

A

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