等比数列{an}的前n项和为Sn,若S3+S6=2S9,求公比.

设等比数列an的前n项和为sn 若s6:s3=1:2 求 s9:s3=? 等比数列{an},前n项和为Sn,若S1,2S2,3S3成等差数列,求{an}的公比 已知等比数列{an}的前n项和为Sn,a2=1,(1)求S3的取值范围；(2)若S3=7/2,求Sn 已知等比数列{An}的前n项和为Sn,若S2：S3=2：3,则公比为? 设等比数列an的前n项的和为Sn,若S6/S3=3,则S9/S6= 设等比数列an的前n项的和为Sn,若S6/S3=3,则S9/S6= 等比数列{an}的前n项和为sn,若S3,S9,S6成等差数列,求此数列的公差, 若Sn为等比数列an的前n项的和,8a2+a5=0,则S6/S3=? 设等比数列｛an｝的前n项和为Sn,若S3+S6=S9,求数列的公差q. 设等比数列{An}的前n项和为Sn,若S6/S3＝3,则S9/S6＝? 设等比数列an的前n项和为Sn,若S6/S3=3,则S9/S6= 设等比数列{an}的前n项和为sn,若s6/s3=3,则s9/s6= 设等比数列An的前n项和为Sn,若S3+S6=2S9,求公比q 设等比数列{An}前n项和为Sn,若S3+S6=2S9,求数列的公比q 等比数列{an}的前n项和为Sn,若S3+S6=2S9,求公比. 设等比数列an的前n项和为Sn,若a1=1,S6=4S3则a4 等比数列{an}的前n项和为Sn,若a1=1,S6=4S3则a4=? 等比数列【an】的前n项和为sn 若s3+3s2=0 则公比q=