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,若S3/S6=1/3,则S6/S12等于 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的值等于 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是等比数列{an}的前n项和,是s3/s6=1/3.则s6/s12= 帮我解2道 数列1 设Sn是等差数列{An}的前项n和,若S3/S5 = 1/3 , 则 S6/ S12 ?2 等差数列 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{an}是公比不等于1的等比数列,Sn是其前n项和,若a1,2a7,3a4成等差数列,求证12S3,S6,S12-S6 设Sn为等差数列｛an｝的前n项和,若S3=3,S6=24,则a9=( ) 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是等比数列{an}的前n项和，S3，S9，S6成等差数列．