Ap(an)中,an=2n+1,若b1=a1,且当n 2时,bn=Abn-1 求bn 求(bn)的前n项和Tn
数列an前n项和为sn,a1=1,数列bn首项b1=2,且sn+n^2=n(an+1),bn=abn-1求an,bn的通
AN=3^(n-1),b1/a1+b2/a2+...+bn/an=n(n+2),求{bn}的前n项和TN.要过程啊.
若数列{an]满足前n项和Sn=2an-4,bn+1=an+2bn,且b1=2,求:bn;{bn}的前n项和Tn
设bn=(an+1/an)^2求数列bn的前n项和Tn
数列{an},a1=1,an=2-2Sn,求an,若bn=n*an,求{bn}的前n项和Tn
an=3*2^(n-1),设bn=n/an求数列bn的前n项和Tn
数列an的前n项和为Sn,Sn=2an-1,数列bn满足b1=2,bn+1=an+bn.求数列bn的前n项和Tn
两题一:数列{an}的前n项和Sn=2an+3n-12,且bn=an*n,求{bn}的前n项和Tn二:{an},a1=1
数列{an}的前n项和Sn=n2+1,数列{bn}满足:b1=1,当n≥2时,bn=abn-1,设数列{bn}的前n项和
等差数列{an},{bn}的前n项和分别为Sn,Tn,若Sn/Tn=2n/3n+1,求an/bn的表达式
a1=1,an=n^2,若bn=(-1)^n*an,求数列{bn}的前n项之和Tn
等差数列{an}、{bn}的前n项和分别为Sn、Tn,若Sn/Tn=2n/3n+1,求an/bn