Sn是等差数列an的前n项和,Bn=1/Sn,a3*b3=0.5,S3+a15=21,求数列bn的前n项和Tn

(1)已知数列an的前n项和为sn满足sn=an²+bn,求证an是等差数列(2)已知等差数列an的前n项和为sn,求证数列sn/n也成等差数列 已知数列{an}的前n项和sn满足sn=an^2+bn,求证{an}是等差数列 a1=1.an+1=2an+2^n.bn=an/2^n-1.证明bn是等差数列、求数列的前n项和sn? 一道数学等差数列的题目等差数列an的前n项和Sn bn的前n项和Tn Sn比Tn=2n/(3n+1) 那么an与bn的比值是 an是等差数列,bn满足bn=an*a(n+1)*a(n+2),bn的前n项和是Sn,若a1=d,用数学归纳法证明Sn=bn*a(n+3)/4d. 设{an}是等差数列,an=2n-1,{bn}是等比数列,bn=2^(n-1)求｛an/bn｝前n项和Sn 已知Sn为等差数列An的前n项和,Bn=Sn/n(n属于正整数）,求证：数列Bn是等差数列 已知等差数列{an}的前n项和为Sn,如果Sn=(an+1/2)^2(n∈N+0,bn=(-1)^n*Sn已知等差数列{an}的前n项和Sn,如果Sn=(an+1/2)^2(n∈N+0,bn=(-1)^n*Sn,试求{bn}的前n项和Tn 证明：数列{an}为等差数列的充要条件是{an}前n项和Sn=An^2+Bn 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 等差数列An,Bn的前n项合分别为Sn和Tn,若Sn/Tn=2n/3n+1,求An/Bn的表达式. 已知两个等差数列{an},{bn}的前n项的和分别为Sn,Tn.若Sn/Tn=(5n+3)/(2n-1).求an/bn 等差数列{an},{bn}的前n项和分别为Sn,Tn,若Sn/Tn=2n/3n+1 ,则an/bn= 已知两个等差数列{an},{bn}的前n项和分别是Sn,Tn,若 Sn/Tn =(2n)/(3n+1),则 an/bn=______. 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 等差数列an`bn`的前n项和分别为Sn`Tn.若Sn/Tn=(7n+1)/(4n+27),求an/bn 等差数列｛an｝,｛bn｝的前n项和分别为Sn,Tn,An/Bn=(7n+1)/(4n+27) 求Sn/Tn 两个等差数列{an},{bn}的前n项和分别为Sn,Tn,若Sn/Tn=2n/3n+1,求an/bn.