设数列{an}的前n项和为Sn=43
设数列{an}的前n项和为Sn,且Sn=2^n-1.
设数列{an}的前n项和为Sn=2an-2n,
设数列{an}的前n项和为Sn=43
设数列{an}的前n项和为Sn,Sn=a
设数列{an}前n项和为Sn,数列{Sn}的前n项和为Tn,满足Tn=2Sn-n2,n∈N*.
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,
设数列{an}的前n项和为Sn,且对任意正整数n,an+Sn=4096
设 数列{an}的前n项和为Sn,已知b*an - 2^n=(b-1)Sn
设数列{an}的前n项和为Sn,且对任意正整数n,an+Sn=4096.
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,已知a1=1,Sn+1=4an+2
设数列An的前n项和为Sn,且a1=1,An+1=1/3Sn,