设数列{An}的前n项和为Sn若An+1=3Sn,a1=1则a6=
设数列{an}的前n项和为Sn,若a1=1,Sn=2an+Sn+(n∈N+),则a6=
设数列{An}的前n项和为Sn若An+1=3Sn,a1=1则a6=
数列{an}的前n项和为Sn,若a1=1,an+1=3Sn(n≥1),则a6=______.
数列{an}的前n项和为Sn,若a1=1,an+1=3Sn(n≧1)则a6=
数列{an}的前n项和为Sn,若a1=1,an+1=3Sn(n≥1),则a6=( )
数列an的前n项和为Sn,a1=1,a(n+1)=3Sn,a6=?
设数列An的前n项和为Sn,且a1=1,An+1=1/3Sn,
设数列{an}的前n项和为Sn,若a1=1,an+1=3Sn(n∈N*),则S6=( )
设数列An的前n项和为Sn,已知a1=1,An+1=Sn+3n+1求证数列{An+3}是等比数列
设数列an的前n项和为Sn,已知a1=1,Sn+1=4an+2
设数列{an}的前n项和为Sn,已知a1=a,an+1=Sn
设数列an的前n项和为Sn,a1=1,an=(Sn/n)+2(n-1)(n∈N*) 求证:数列an为等差数列,