等比数列的公比为q,前n项和,成等差数列则公比为多少

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（　　） 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,则q的三次方等于多少, 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= 已知等比数列｛αn｝的公比为q(q为实数）,前n项和为Sn,且S3,S9,S6成等差数列,则q3等于什么? 等比数列{an}的前n项和为Sn,已知S1,S3,S2成等差数列,求｛an｝的公比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. 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,则q^3=( ) 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＝