两等差数列﹛an﹜﹛bn﹜前n项和之比为5n+3/2n+7.则a5/b5的值为?

两等差数列﹛an﹜﹛bn﹜前n项和之比为5n+3/2n+7.则an/bn的值为? 两等差数列﹛an﹜﹛bn﹜前n项和之比为5n+3/2n+7.则a5/b5的值为? 两等差数列﹛an﹜﹛bn﹜前n项和之比为5n+3/2n+7.则a5/b5的值为?（具体） 已知等差数列﹛an﹜的前n项和为Sn,且a3=5,S6=36,bn=2an×2的an次方求数列﹛bn﹜的前n项和Tn 设﹛an﹜是等差数列,Sn是其前n项和,求证:以bn=Sn／n﹙n∈N*)为通项公式的数列﹛bn﹜是等差数列 两等差数列an.bn前n项和之比Sn/Tn=4n+1/9n+2,求a20/b20 已知等比数列{an},首项为81,数列{bn}满足bn=㏒3an,其前n项和为Sn,求证﹛bn﹜为等差数列.Thang you! 已知公差大于零的等差数列｛an｝的前n项和为Sn,且满足:a3*a4=117,a2+a5=221.等差数列{an}2.若数列{bn}是等差数列,bn=Sn/(n+c),求非零常数c；3.若2中的{bn}的前n项和为Tn,求证：2Tn-3bn-1＞64bn/﹛(n+9)*bn+1﹜ 已知两个等差数列{an}和{bn}的前n项和分别为An和Bn, 已知两个等差数列{an},{bn}的前n项和之比为(2n+1)/(3n-7),则a9/b9等于? 2个等差数列{An}、{Bn}的前n项和之比为5n+3/2n-1.则A10/B10=多少?详细解答 等差数列an与bn的前n项和之比为5n+3/4n+5 求a10/b10 等差数列{an}与{bn}的前n项和之比为(5n+3):(4n+5),求a10/b10的值, 已知两个等差数列{an}和{bn}的前n项和分别为An和Bn,且An比Bn=7n+45比n+3,则an除以bn为正整数n的个数是多少 已知等差数列﹛an﹜的前n项和为377,项数n为奇数,且前n项和中奇数项和与偶数项和之比为7∶6 求中间项 已知等差数列﹛an﹜中,an＞0,前n项和Sn=1/8（an+2）²若bn=0.5an-30求数列{bn}前n项和Tn及其最小值 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 设正项数列﹛An﹜的前n项和为Sn,若﹛An﹜和﹛√Sn﹜都是等差数列,且公差相等若a1,a2,a5恰为等比数列{bn}的前三项,记数列cn=24bn/(12bn-1)²,数列{cn}的前n项和为Tn,求证：对任意n为正整数,都有Tn