数列{an}的前n项和Sn满足:Sn =2an-3n(n∈N*) 1.证明{an+3}是等比数列
数列{an}的前n项和Sn满足:Sn =2an-3n(n∈N*) 1.证明{an+3}是等比数列
已知数列an的前n项和为sn,且sn+an=n^2+3n+5/2,证明数列{an-n}是等比数列
数列{an}的前n项和为Sn,Sn=2an-3n(n∈N)(1)证明数列an+3是等比数列,(2)求数列an的通项公式
已知数列(an)的前n项和为Sn,满足an+Sn=2n,证明数列(an-2)为等比数列并求出an
数列{an}的前n项和Sn满足:Sn=2an-3n(n属于N*)
问道高中等比数列题 Sn是数列{an}的前n项和,且Sn=2an-3n+5 .证明{an+3}是等比数列
数列an的前n项和Sn满足:Sn=2an-3n
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项和为Sn,已知A1=1,An+1=Sn*(n+2)/n,证明数列Sn/n是等比数列
数列{an}前n项和为Sn,且an+Sn=-2n-1 证明{an+2}是等比数列
已知等差数列{an}的前n项和为Sn,满足关系lg(Sn+1)=n (n∈N*).试证明数列{an}为等比数列
等比数列证明题设数列an的前n项和为Sn,且Sn=4an-3怎么证明数列an是等比数列