{an}{bn}都是等差数列,已知An/Bn(各自前n项和)=(5n+3)/(2n-1)
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
已知数列{an},{bn}都是等差数列,其前n项和为Sn,Tn,且Sn/Tn=(n+1)/(2n-3)
已知两个等差数列{an},{bn}的前n项和分别是Sn,Tn,若 Sn/Tn =(2n)/(3n+1),则 an/bn=
已知数列an的前n项和为sn=5/6n(n+3),1:求证an为等差数列 2:设bn=a3n+a
已知两个等差数列{an}和{bn}的前n项和分别为An,Bn,且An/Bn=(3n-3)/(2n+3),则a6/b6=
已知等差数列an和bn的前n项和分别为An,Bn,且An/Bn=(3n+1)/(2n-1).若ak/bk=34/21,则
已知等差数列an的通项公式为an=1+2n,令bn=an的平方-1,求bn的前n项和
已知等差数列an=2n-1,若数列bn=an+q^an,求数列{bn}的前n项和Sn,求详解
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
必修5的数列问题若两个等差数列{an}和{bn}的前n项和An和Bn满足关系式An/Bn=(3n+1)/(2n+3) (