数列an中,已知a1=6,nan-na【(n-1)】下标=a(n-1)+n方+n(n>=2) 1设bn=an/(n+1)
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
在数列an中a1=2,a(n+1)下标=4an-3n+1 1设bn=an-n求证bn是等比数列 2求数列an的前n项和s
已知数列an中,a1=1 2a(n+1)-an=n-2/n(n+1)(n+2) 若bn=an-1/n(n+1)
在数列{an}中,a1=1,an+1=[(n+1)/n]*an+2(n+1),设bn=an/n,(1)证明数列{bn}是
已知数列{an}满足a1=3,且an+1-3an=3n,(n∈N*),数列{bn}满足bn=3-nan.
设数列{an}满足a1+2a2+3a3+.+nan=n(n+1)(n+2)
已知数列(An)中,A1=1/3,AnA(n-1)=A(n-1)-An(n>=2),数列Bn满足Bn=1/An
已知数列{an}满足a1=1,a(n+1)=nan n+1是角标
已知数列an中,a1=2且a n+1(下标)=[n+2/n]×an,求通项公式
已知数列{an}中,a1=1,an+a(n+1)=2^n(n∈N*),bn=3an
已知在数列{an}中,a1=2,na[n+1]=(n+1)an+2 (n∈N*),a10=( ) 注:[ ]为下标
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.