已知{An}为等差数列,Bn=A3n+1,求证数列Bn为等差数列.
已知数列an的前n项和为sn=5/6n(n+3),1:求证an为等差数列 2:设bn=a3n+a
已知数列{an}为等差数列,求证:{a3n+a3n-1}是等差数列.
已知数列an的通项公式为an=lg3^n-lg2^(n+1)数列bn的通项bn=a3n,求bn是否为等差数列
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
若数列{an},{bn}都是等差数列,s,t 为已知常数,求证数列{ s an+t bn}是等差数列
已知{an}是等差数列,bn=kan+m(k,m为常数).求证{bn}是等差数列
已知数列{An}及数列{Bn}都为等差数列,Cn=An+Bn,证数列{Cn}为等差数列
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
已知数列an是等差数列 且bn=2^a{n}求证bn为等比数列 {}里为下标 ^为上标
已知数列an是等差数列,且bn=an+a(n+1).求证数列bn是等差数列.
已知数列{An}是等差数列,且Bn=An+A(n+1).求证数列{Bn}是等差数列
已知等比数列{an},首项为81,数列{bn}满足bn=㏒3an,其前n项和为Sn,求证﹛bn﹜为等差数列.