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=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bn也是等差数列
已知数列{an}为等差数列,且a1=2,a1+a2+a3=12,令bn=3^an,求证,数列{bn}是等比数列
已知数列{an}得前n项和为sn=an^2+bn(a,b为常数且a不等于0)求证数列{an}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=2的an次方,求证数列{bn}是等比数列
已知数列{an}中a1=-1且(n+1)an,(n+2)an+1(是下标)成等差数列,设bn=(n+1)an-n+2求证
若数列{an}是公比为q的等比数列,且bn=lgan,求证{bn}为等差数列
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.
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
已知数列{an(n下标)}满足a1(1下标)=1,a2(2下标)=3,.求证:bn(n下标)是等差数列.