两个等差数列{an}和{bn}中,a1=2,且对任意的正整数n,3a(n+1)-an=0,bn是an与a(n+1)的等差

已知数列an的前n项和为sn,且对任意正整数n都有an是n与sn的等差中项(1)bn=an+1,求bn 数列{an}和{bn}中,a1=1,a2=2,an>0,bn=根号(an*a(n+1))(n为正整数),且{bn}是以q 已知两等差数列an.bn,且a1+a2+.+an/b1+b2+.+bn=3n+1/4n+3,对于任意正整数n都成立,求a 有两个正数数列an,bn,对任意正整数n,有an,bn,an+1成等比数列,bn,an+1,bn+1成等差数列,若a1= 已知正项数列{an},{bn}满足：a1=3,a2=6,{bn}是等差数列,且对任意正整数n,都有bn,根号an,bn+ 数列{an}、{bn}的每一项都是正数,a1=8,b1=16,且an,bn,a(n+1)成等差,bn,a(n+1),b( 已知等比数列{an}的前n项和为Sn,且an是Sn与2的等差中项,等差数列{bn}中,b1=2,点P(bn,bn+1)在 等差数列{an},{bn}的前n项和分别为An,Bn,切An/Bn=2n/3n+1,求lim(n→∞)an/bn 已知数列{an}是等差数列,且bn=an+a(n-1),求证bn也是等差数列 {a} 、{b} 都是各项为正的数列,对任意的正整数n,都有an,bn^2,an+1 成等差数列,bn^2,an+1,b 已知{an},{bn}均为等差数列,前n项的和为An,Bn,且An/Bn=2n/(3n+1),求a10/b10的值 已知数列{an}中,a1=3\5,an.a(n-1)=2a(n-1)(n≥2,n∈N).数列{bn}是等差数列且满足bn