设正数a,b满足limx→2(x2+ax−b)=4,则limn→∞an+1+abn−1an−1+2bn=( )
已知limn→∞an2+cnbn2+c=2,limn→∞bn+ccn+a=3,则limn→∞an2+bn+ccn2+an
已知等比数列{an}的公比q>1,a1=b(b≠0),则limn→∞a
急 设A1=2,A2=4,数列Bn满足:Bn=A(n+1)-An,B(n+1)=2Bn +2
急 设A1=2,A2=4,数列BN满足:Bn=A(n+1)-An,B(n+1)=2Bn+2
设a1=2,a2=4,数列{bn}满足:bn=a(n+1)-an,b(n+1)=2bn+2.
设A1=2,A2=4,数列{Bn}满足:Bn=A(n+1) –An,B(n+1)=2Bn+2.
数列{an}满足a1=4,an=4-4an−1(n≥2),设bn=1an−2.
已知等差数列{an}满足a2=3,a5=9,若数列{bn}满足b1=3, bn+1=abn,则{bn}的通项公
已知数列an,bn满足a1=1,a2=3,(b(n)+1)/bn=2,bn=a(n+1)-an,(n∈正整数)
已知数列an,bn,cn满足[a(n+1)-an][b(n+1)-bn]=cn 若数列an的通项公式为an=2n-1 设
数列{an}的前n项和Sn=n2+1,数列{bn}满足:b1=1,当n≥2时,bn=abn-1,设数列{bn}的前n项和
已知数列an,bn,cn满足[a(n+1)-an][b(n+1)-bn]=cn