设等比数列{an}的前n项和为Sn,若S6:S3=1:2,则S9:S3=______.
设等比数列{an}的前n项和为Sn,若S6:S3=1:2,则S9:S3=?
设等比数列an的前n项的和为Sn,若S6/S3=3,则S9/S6=
1.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项的和为Sn,若S6/S3=1/2,则S9/S3=
已知正项等比数列{an}的前n项和为Sn,若S3=3,S9-S6=12,则S6=______.
等比数列{an}的前n项和为sn,若s3+s6=2s9,则数列的公比为______.
设等比数列{an}的前n项和为sn,若S6,S9,S3成等差数列,问2S3,S6,S12-S6S能否成等比数列?请说明理
设Sn是等比数列{an}的前n项和,S3,S9,S6成等差数列,则公比q=______.
设Sn是等比数列{an}的前n项和,S3,S9,S6成等差数列.
设Sn是等比数列{an}的前n项和,S3,S9,S6成等差数列,且a2+a5=2am,则m等于( )
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.
等比数列an前n项之和为Sn,若S3=2.S6=3,则S9=