题目内容
设{an}是公比为q的等比数列,Sn是它的前n项和,若{Sn}是等差数列,则q=_____.
设{an}是公比为q的等比数列,Sn是它的前n项和.若{Sn}是等差数列,则q =
设{an}是公比为q的等比数列,Sn是它的前n项和.若{Sn}是等差数列,则q= .
设{an}是公比为q的等比数列,Sn是它的前n项和.若{Sn}是等差数列,则q = .