设数列1/(1+根2),1/(根2+根3),……,1/(根n+根(n+1))的前n项和为Sn,求Sn
设数列1/(1+根2),1/(根2+根3),……,1/(根n+根(n+1))的前n项和为Sn,求Sn
已知数列an的首项a1=5,前n项和为Sn,且S(n+1)=2Sn+n+5(n∈N*),求数列{an}的前n项和Sn,设
设数列An的前n项和为Sn,已知a(1)+2a(2)+3a(3)+…+na(n)=(n-1)Sn+2n(n为正整数).求
数列an=log2n+1n+2(n∈N*),设其前n项和为Sn,则使Sn<-5成立的自然数n( )
已知数列{an}的前n项和为Sn,且2Sn=2-(2n-1)an(n属于N*)(1)设bn=(2n+1)Sn,求数列{b
设数列{an}的前n项和为Sn,已知Sn=2an-2n+1,(n为下标,n+1为上标),求通项公式?
已知数列{an}的首项是a1=1,前n项和为Sn,且Sn+1=2Sn+3n+1(n∈N*).
设数列(an)的首项a1=1,前n项和为Sn ,且Sn+1=2n平方+3n+1 n属于N ,求数列的通项公式an
设数列{an}的前n项和为Sn,且2an=Sn+2n+1(n∈N*).
设数列{an}的前n项和为sn,已知a1+2a2+3a3+…+nan=(n-1)Sn+2n(n∈N*)
已知数列{an}的前n项和为Sn=1+2+3+4+…+n,求f(n)= Sn /(n+32)Sn+1的最大值
数列{bn}的前n项和为Sn,且Sn,且Sn=1-1/2bn(n∈N+) 求{bn}的通项公式