数列{an}为等差数列,数列{bn}满足bn=2an+1+a2n-1,证明{bn}为等差数列
已知等比数列{bn}是公比为q与数列{an}满足bn=3^an,(1)证明数列{an}是等差数列 (2)若b8=3,且数
设各项均为正数的数列{an}和{bn}满足:an,bn,an+1成等差数列,bn,an+1,bn+1等比数列且a1=1,
已知数列an满足a1=2 其前n项和为Sn Sn =n+7~3an 数列bn满足 bn=an~1 证明数列bn是等差数列
已知{an}是首项为1,公差为1的等差数列,若数列{bn}满足b1=1,bn+1=bn+2^an
设数列{an},{bn},满足an=[lg(b1)+lg(b2)+...+lg(bn)]/n,证明{an}为等差数列的冲
已知数列{an}满足a1+a/4,(1-an)a(n+1)=1/4,令bn+an-1/2 求证数列{1/bn}为等差数列
数列an,bn各项均为正数,对任意n,an,bn,an+1成等差数列,bn,an+1,bn+1成等比数列证数列根号BN成
已知等差数列{an},a1=a,公差d=1.若bn=an^2-a(n+1)^2,试判断数列{bn}是否为等差数列.并证明
关于数列和 不等式.1.若两等差数列{an}{bn}的前n项和为 An Bn ,满足(An/Bn)=(7n+1)/4n+
【紧急--高一数学】已知数列{an}是首项a1=a,公差为2的等差数列;数列{bn}满足2bn=(n+1)an
(高二数学)已知数列{an}是首项a1=a,公差为2的等差数列;数列{bn}满足2bn=(n+1)an
29(14):已知数列{an}是首项a1=m,公差为2的等差数列;数列{bn}满足2bn=(n+1)an.