已知{an}、{bn}都是公差不为零的等差数列,则数列{an+bn},{bn-an},{3an-bn},{5an+4}…

已知数列{An}与{Bn}都是公差不为零的等差数列,且limAn/Bn=2,求lim(A1+A2+……+An)/(n*B 已知数列{An}与{Bn}都是公差不为零的等差数列,且limAn/Bn=3,求lim(B1+B2+……+B2n)/(n* 已知数列{an}、{bn}都是公差不为零的等差数列,且liman/bn=3,求lim(b1+b2+……b3n)/(n*a 已知{an}是公差不为零的等差数列,{bn}是各项都是正数的等比数列. 已知等差数列{An}的首项为a1,公差为d,数列{Bn}中,bn=3an+4,试判断该数列是否为等 设数列{an}{bn}均为等差数列,公差都不为0,无穷数列liman/bn=3,则无穷数列limb1+b2+...+bn 已知{an}是首项为1,公差为1的等差数列,若数列{bn}满足b1=1,bn+1=bn+2^an 若数列{an},{bn}都是等差数列,s,t 为已知常数,求证数列{ s an+t bn}是等差数列 已知等差数列an的公差不为零,且a3=5,a1,a2,a5成等比数列.数列bn满足b1+2b2+4 已知{an}{bn}都是公差不为0的等差数列.且lim(n趋近无穷)an/bn=2.求lim(n趋近无穷)(a1+a2+ 已知数列【an】是首项为a,公差为1的等差数列,数列【bn】满足 数列{an},{bn}都是等差数列,公差分别为d1,d2,那么{an+qbn}(q为常数)的公差