设Sn是等差数列an的前n项和,若S3/S7=1/3,则S6/S7=

设Sn是等差数列an的前n项和,若S3/S7=1/3,则S6/S7= 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/S7=? 设Sn是等差数列{an}的前n项和,若S3/S6=1/3,求S6/S12 设Sn是等差数列(An)的前n项和,若S3/S6=1/3,求S6/S12=? 设Sn是等差数列{An}的前n项和,若S3/S6=1/3,则S6/S12=? 1.设Sn是等差数列【An]的前n项和,若S3/S6=1/3,求S6/S12 设Sn是等差数列{an}的前n项和,若S3/S6=1/4,则S6/S12等于? 设Sn是等差数列an的前n项和,若S5/S3=5/9,则S9/S5= 设Sn是等差数列{an}的前n项和,若S3/S6=1/3,则S6/S12=? 设等差数列{an}的前n项和为Sn,若a6=S3=12,则an=多少? 设等差数列{an}的前n项和为Sn,若a6=S3=12,则an=? 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是等差数列an的前n项和,s6/s12=3/10,则s3/s9=¿ 设等差数列的前n项和为Sn,若a6=S3=12,则an=? 设等差数列an的前n项和Sn 若S3=9,S6=36a7+a8+a9=? 设等差数列an的前n项和为sn,若s4/12-s3/9=1,则公差为? 设等差数列{an}的前n项和为Sn,若S6/S3=3,则S9/S6=?