等差数列前n项和为Sn若S3=9S6=36则a7+a8+a9=?
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等差数列前n项和为Sn若S3=9S6=36则a7+a8+a9=?
等差数列前n项和为Sn若S3=9S6=36则a7+a8+a9=?
等差数列前n项和为Sn若S3=9S6=36则a7+a8+a9=?
自己解决
已知等差数列前n项和为Sn,S6/S3=3 求S9除S6
等差数列(an)的前n项和sn,若s6:s3=3,求s9:s6
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=?
等差数列的前n项和为Sn,若S3=S6,则S9=?
等差数列前n项和为Sn若S3=9S6=36则a7+a8+a9=?
设等差数列的前n项和为Sn,若S3=9,S6=36,求a7+a8+a9
设Sn为等差数列{an}的前n项和,若S3=3,S6=24,则a9=( )
设Sn是等差数列an的前n项和,若S3/S6=1/3,则S6/S7=?
Sn是等差数列an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=1/3,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=1/3,则S6/S12=?
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,求S6/S12
sn是等差数列{an}前n项和,若s3/s6=1/3,求s6/s12
1.设Sn是等差数列【An]的前n项和,若S3/S6=1/3,求S6/S12
已知等比数列{an}的前n项和为Sn,若S3,S9,S6成等差数列,则 A S6=-1/2xS3 B S6=-S3 C S6=1/2xS3 D S6=2S3