设等比数列an的前n项和为Sn,若S5,S4,S6成等差数列,则数列an的公比q的值为
若Sn是公比为q的等比数列{an}的前n项和,且S4,S6,S5成等差数列,则公比q=______.
已知Sn是等比数列{an}的前n项和,设公比为q,且S3,S9,S6成等差数列.
设数列an为公比为q的等比数列,它的前n项和为sn,若数列sn为等差数列,则q的值
已知Sn是等比数列{an}得前n项和,S2,S6,S4成等差数列,求数列{an}的公比q?
等比数列an的公比为1/3,前n项和为Sn,n属于正整数.如S2,S4-S2,S6-S4成等比数列.则其公比为
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,则公比q为( )
设等比数列{an}的公比q=2,前n项和为Sn,S4\a2
已知等比数列{An}的公比为q,前n项的和为Sn,且S3,S9,S6成等差数列.
已知Sn是等比数列{An}的前n次和,S2,S6,S4成等差数列,求数列{An}的公比q
已知等比数列{An}的公比为q,前n项和为Sn,且S3,S9,S6成等差数列
设Sn是等比数列的前n项和,若S3,S9,S6成等差数列,这an的公比q为多少
等比数列{an}的公比为q,其前n项和为Sn,若S3,S9,S6成等差数列,则q^3=