Sn是等差数列an的前n项和,若S6=36,Sn=324,S(n-6)=144(n>6),则n等于?
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等差数列(an)的前n项和sn,若s6:s3=3,求s9:s6
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=1/3,则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?
Sn是等差数列an前n项和,若S3/S6=1/3,则S6/S12=?
sn是等差数列{an}前n项和,若s3/s6=1/3,求s6/s12
等差数列an的前n项和为sn若s6/S3=3,则s9/S6=?
设等差数列{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,若S3/S7=1/3,则S6/S7=
Sn是等差数列an的前n项和,若S6=36,Sn=324,S(n-6)=144(n>6),则n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,若S3/S6=1/3,则S6/S12等于——
设Sn是等差数列an的前n项和,s6/s12=3/10,则s3/s9=¿