s3/S6=1/3

等比数列S6/S3=(1-q^3)S3/S3S6/S3=(1-q^3)S3/S3为什么S6=(1-q^3)S3等比数列S6/S3=(1-q^3)S3/S3S6/S3=(1-q^3)S3/S3为什么S6

设Sn是等差数列an前n项和若S3/S6=1/3则S6/S12正确的做法我知道但我这种做法怎么错了Sn成等差所以S3,S6-S3,S12-S6也成等差因为S3/S6=1/3,所以S6-S3=2S3,所

已知等差数列{an}S3:S6=1/3S6:S12=?已知等差数列{an}S3:S6=1/3S6:S12=?已知等差数列{an}S3:S6=1/3S6:S12=?S3/S6=[(a1+a3)*3/2]

等比数列S6/S3=3则S9/S6=?等比数列S6/S3=3则S9/S6=?等比数列S6/S3=3则S9/S6=?由S6/S3=3得{1-q^6}/{1-q^3}=3所以q^3=2而S9/S6={1-

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,则S6/S7=?设Sn是等差数列an的前n项和,若S3/S6=1/3,则S6

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,则S6/S12=?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,求S6/S12=?设Sn是等差数列(An)的前n项和,若S3/S6

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

设Sn是等差数列的前n项和,S3:S6=1:3,则S6:S9=设Sn是等差数列的前n项和,S3:S6=1:3,则S6:S9=设Sn是等差数列的前n项和,S3:S6=1:3,则S6:S9=答案1:2方法

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

关于等差数列的一题已知在等差数列中,S3/S6=1/3,求S6/S12?关于等差数列的一题已知在等差数列中,S3/S6=1/3,求S6/S12?关于等差数列的一题已知在等差数列中,S3/S6=1/3,

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

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

sn是等差数列｛an}前n项和,若s3/s6=1/3,求s6/s12sn是等差数列｛an}前n项和,若s3/s6=1/3,求s6/s12sn是等差数列｛an}前n项和,若s3/s6=1/3,求s6/s

1.设Sn是等差数列【An]的前n项和,若S3/S6=1/3,求S6/S121.设Sn是等差数列【An]的前n项和,若S3/S6=1/3,求S6/S121.设Sn是等差数列【An]的前n项和,若S3/

已知等比数列{an}的前n项和为Sn,若S3,S9,S6成等差数列,则AS6=-1/2xS3BS6=-S3CS6=1/2xS3DS6=2S3已知等比数列{an}的前n项和为Sn,若S3,S9,S6成等

等比数列a1=1s6=4s3求a4sudu等比数列a1=1s6=4s3求a4sudu等比数列a1=1s6=4s3求a4sudus6/s3=(1-q^6)/(1-q^3)=1+q^3=4q^3=3a4=

等比数列已知s6/s3=3/2求s12/s9等比数列已知s6/s3=3/2求s12/s9等比数列已知s6/s3=3/2求s12/s9s6/s3=3/2s6-s3=（s3）/2S3,S6-S3,S9-S

等比数列前n项和Sn,S6/S3=3,S9/S6=?等比数列前n项和Sn,S6/S3=3,S9/S6=?等比数列前n项和Sn,S6/S3=3,S9/S6=?S3=a1(1-q^3)/(1-q)S6=a

等比数列的前项和Sn,若S6/S3=3,则S9/S6=?等比数列的前项和Sn,若S6/S3=3,则S9/S6=?等比数列的前项和Sn,若S6/S3=3,则S9/S6=?因为S6/S3=（1-q^6）/