前不久,在我校的一次高三月考中,出现了一道数列概念题,学生的得分率很低,引起了我们教师的关注.本文尝试对这道数列概念题进行一些理论探讨.探究该数列特征、性质,是否具有通项公式,与我们学过的哪个数列相关,如何应用并指导解题.月考试题在数列{an}中,如果对任意n∈N*都有an+2-an+1an+1-an=k(k为常数),则称数列{an}为差等比数列,k称 Not long ago, in my high school exam in March, there was a series of conceptions, the students’ scoring rate is very low, aroused the concern of our teachers.This paper attempts to make some theoretical discussions on this series of conceptions. How to apply and guide the problem solving in the sequence {an}, if there is an + 2-an for any n∈N * + 1an + 1-an = k (k is a constant), then said the number of columns {an} for the geometric sequence, k