数列{An}前n项和记为Sn,A1=t,An+1=2Sn+1(n属于正整数),当t为何值时,数列{An}是等比数列.
数列{An}前n项和记为Sn,A1=t,An+1=2Sn+1(n属于正整数),当t为何值时,数列{An}是等比数列.
数列an的前n项和为Sn,a1=t,2a(n+1)=-3Sn+4 求a2,a3 t为何值an等比
数列an的前n项和伟Sn,a1=t,点(Sn,an+1)在直线y=2x+1上,问当t=何值时 {an}为等比数列?
数列An的前n项和为Sn,已知A1=1,An+1=Sn*(n+2)/n,证明数列Sn/n是等比数列
已知数列{An},Sn是其前n项和,且满足3An=2Sn+n,n为正整数,求证数列{An+1/2}为等比数列
数列{an}的前n项和记为Sn,a1=t,an+1=2Sn+1(n∈N*).
等比数列的证明方式数列An的前n项和为Sn,A1=1,A(n+1)=2Sn+1,证明数列An是等比数列
数列{an}的前n项和为Sn,a1=1,an+1=2Sn (n∈正整数)
数列{an}前n项和为Sn,且an+Sn=-2n-1 证明{an+2}是等比数列
在数列an中,Sn是数列an前n项和,a1=1,当n≥2时,sn^2=an(Sn-1/2) (1)证明1/Sn为等差数列
数列{an}的前n项和记为sn,已知a1=1,An+1=(n+2)sn/n 1数列{sn/n}是等比数列 2sn+1=4
an的前n项和Sn,a1=1,an+1=(n+2)/nSn,证数列Sn/n是等比数列和Sn+1=4an