设Sn是等差数列an的前n项和,s6/s12=3/10,则s3/s9=¿
设Sn是等差数列An的前n项和,若S3/S6=1/3,则S6/S12等于
设Sn是等差数列{an}的前N项和,诺S3/S6=1/3则S6/S12=多少
设Sn是等差数列{an}的前n项和,若S3/S6=1/3,则S6/S12等于——
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,是s3/s6=1/3.则s6/s12=
设Sn是等比数列{an}的前n项和,S3,S9,S6成等差数列.
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Sn是等差数列『An』的前n项和,诺S3/S6=1/3,则S6/S12的值等于
已知Sn是等比数列{An}的前N项和,S3,S9,S6成等差数列,则
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,且a2+a5=2am,则m等于( )