正项无穷等比数列{an}前n项和为Sn,lim(Sn/Sn+1)=1 求公比范围
正项无穷等比数列{an}前n项和为Sn,lim(Sn/Sn+1)=1 求公比范围
已知无穷等比数列{an}首项为1,公比为q,前n项和为Sn,求lim(Sn/Sn+1)
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
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等于多少?若an=1,求sn前n
已知无穷等比数列{an}的首项为a1,公比为q(q>0),设这个数列的前n项和为Sn,求lim(n→∞)[Sn+1]/[
已知等比数列{an}的首项为a1,公比为q,sn是它的前n项和,若lim(1/sn)存在,求公比q的取值范围
等比数列an的前n项和为sn,sn=1+3an,求:an
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( )
等比数列中,sn为前n项和,sn=2an—1,求an
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=