等比数列{an}中,公比为q,前n项和为Sn,若Sn+1,Sn,Sn+2成等差则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,前n项和为Sn,若Sn+1,Sn,Sn+2成等差数列,则公比q为( )
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等于多少?若an=1,求sn前n
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=
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?
已知等比数列{an}的公比为q,前n项和为Sn,求[Sn*Sn+2-(Sn+1)^2]/[an*an+2]
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的值为() 我知道答案是-2,可
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,求q的值
设Sn为等比数列{an}的前n项和,已知Sn=3an+1+m,Sn-1=3an+m,则公比q=
设等比数列{ an}的公比为q,q>0且q≠1,Sn为{an}的前n项和,记Tn=an/Sn,则
若等比数列an公比为q,Sn是其前n项和,若lim(an+1/Sn)=q-1,求q的取值范围
设等比数列{an}的公比q=2,前n项和为Sn,S4\a2