我们常常碰到这样一类数列,{a_n}在这个数列中的每一项都是一个等差数列{An+B}和一个等比数列{q~n}(q≠1)对应项的乘积,我们不妨称之为差比数列.差比型数列求和问题是常见的数列求和问题,本文对该类数列题进行了探讨,总结了该数列求和的三种方法.设差比型数列{a_n}的通式为a_n=(An+B)q~n(q≠1),其中的Bqn部分在进行前n项求 We often encounter such a series, each of {a_n} in this series is the product of an equal difference sequence {An + B} and an equivalent sequence {q ~ n} (q ≠ 1) , We may wish to call it the difference between the series.Difference than the series summation is a common series of summation problems, this article discusses these series of questions, summed up the sequence of the sum of the three methods. Difference ratio The sequence {a_n} is a_n = (An + B) q ~ n (q ≠ 1), where the Bqn part