等差数列除以等比数列 an=n bn=2^n-3 求an除以bn的前n项和
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
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
等差数列{an},an=2n-1,等比数列{bn},bn=2n-1,求{anbn}的前n项和.
已知数列an满足bn=an-3n,且bn为等比数列,求an前n项和Sn
已知等差数列an=2n,等比数列bn=2*3^(n-1)(2乘以3的n减1次方),设cn=an/bn,求cn前n项和Tn
等差数列an,bn的前n项和分别为Sn,若Sn/Tn=2n/(3n+1),求an/bn的表达式
等差数列{an},{bn}的前n项和分别为Sn,Tn,若Sn/Tn=2n/3n+1,求an/bn的表达式
等差数列{an}、{bn}的前n项和分别为Sn、Tn,若Sn/Tn=2n/3n+1,求an/bn
两个等差数列{an},{bn}的前n项和分别为Sn,Tn,若Sn/Tn=2n/3n+1,求an/bn.
等差数列an,bn的前n项和分别为Sn,若Sn/Tn=2n/(3n+1),求lim an/bn
等差数列{an}中an=2n+1,等比数列{bn}满足b1=a2,b2=a4求{bn}前n项和Sn
an=3*2^(n-1),设bn=n/an求数列bn的前n项和Tn