an+1=kan+j·bn+l型数列,其中k,j,b,l为常数,在高考模拟考等考试中常常出现,下面对其通项的求法进行探讨.一、当j=0时,an+1=kan+l型(简称1型)1.当k=1时,an+1=an+l,数列{an}是等差数列,其通项为an=a1+(n-1)l.2.当k≠0,l=0时,an+1=kan,数列≠an≠是等比数列(a1≠0). an + 1 = kan + j · bn + l type series, where k, j, b, l is a constant in the entrance exam simulation test often appear, the following discussion of its general approach. = 0, an + 1 = kan + l type (abbreviated as type 1) 1. When k = 1, an + 1 = an + l, the sequence {an} is an arithmetic sequence with the general term an = a1 + n-1) l.2. When k ≠ 0, l = 0, an + 1 = kan, the sequence ≠ an ≠ is the geometric sequence (a1 ≠ 0).