设数列的前N项和为SN,已知A1等于1,SN=NAN-N(N-1) 若数列AN乘AN分之一的前N项和为TN,问,满足TN
已知数列{an}前n项和为Sn,a1=1,an+1=2Sn,求{nan}的前n项和Tn.
数列 an的前n项和为Sn,a1=1,an+1=2Sn 求数列{nan}的前n项和Tn
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*.
已知数列{an}的前N项和为Sn 且an+1=Sn-n+3,a1=2,设Bn=n/Sn-n+2前N项和为Tn 求证Tn
已知数列{an}的前n项和为Tn,且满足Tn=1-an,数列{bn}的前n项和Sn,Sn=1-bn,设Cn=1/Tn,证
数列an的前n项和Sn,a1=1,a(n+1)(下标)=2Sn.求通项an 求nan的前n项和Tn
已知数列{an}的通项为an=n,前n项和为Sn,求数列{1/Sn}的前n项和Tn的表达式
已知数列{an}的前n项和为Sn,a1=1,a(n+1)=1+2Sn.设bn=n/an,求证:数列{bn}的前n项和Tn
设数列{an}的前n项和为Sn,令Tn=(S1+S2+...+Sn)/n,称Tn为数列a1,a2,...an的“平均和”
数列{an}的前n项和为Sn,a1=1,an+1(n+1是下标)=2Sn+1,求数列{nan}的前n项和为Tn
设数列{An}的前n项和为Sn,令Tn=(S1+S2+.+Sn)/n,称Tn为数列A1,A2,...,An的理想数.如果
设数列{an}的前n项和为Sn,已知a1=1,Sn=nan-n(n-1)(n∈N+)