2n^2-1/2n=an^2+bn,求ab
等差数列{an},{bn}的前n项和分别为An,Bn,切An/Bn=2n/3n+1,求lim(n→∞)an/bn
an=3*2^(n-1),设bn=n/an求数列bn的前n项和Tn
已知数列{an}和{bn}满足关系式:bn=a1+a2+a3+...+an/n(n属于N*) (1)若bn=n^2,求数
在数列{an}中,a1=1,an+1=(1+1/n)an+(n+1)/(2^n) (1) 设bn=an/n,求数列{bn
已知数列{an},an=2n+1,数列{bn},bn=1/2^n.求数列{an/bn}的前n项和
an=2*3^n-1 若数列bn满足bn=an+(-1)^n*ln(an),求数列bn前n项和Sn
已知{an},{bn}均为等差数列,前n项的和为An,Bn,且An/Bn=2n/(3n+1),求a10/b10的值
设bn=(an+1/an)^2求数列bn的前n项和Tn
a1=1,a(n+1)=(1+1/n)an+n+1/2^n,设bn=an/n求数列bn的通项公式
数列{an}=2n+1,使bn=1/an^2-1,求bn前n项和,
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),求数列
数列an,满足Sn=n^2+2n+1,设bn=an*2^n,求bn的前n项和Tn