在等比数列中,前n项之和Sn=93,an=48,公比为2,则n=

在等比数列{an}中,a1=2,公比为q,前n项和为Sn,若数列{Sn+2}也是等比数列,则q等于? 设等比数列{an}的公比q=2,前n项和为Sn,S4\a2 等比数列{an}的首项是a1,公比是q,前n项之和为Sn,所有项的和为S,则lim(S1+S2+...+Sn-nS)=_ 设等比数列 ｛an｝ 的公比为q,前n项和为Sn,若S(n+1),Sn,S(n+2)成等差数列,则q= 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q=? 设等比数列an的公比为q=1/2,前n项和为Sn,则S4/a4=? 设等比数列an的公比q=2,前n项和为Sn,则S4/a4= 设等比数列{an}的公比q=2,前n项和为Sn,则S4/a2=? 设等比数列an的公比q=2,前n项和为sn,则s4\a2= 设等比数列an的公比q=2,前n项和为sn,则s4除以a2= 设等比数列{an}的公比q=1/2,前n项和为Sn,则S4/a4= 设等比数列an的公比q=1/2,前n项和为sn,则s4/a4=