“叠加法”与“累乘法”在高考数列问题中倍受青睐,尤其是在求解数列的通项公式问题时,其地位就愈加突出.下面让我们做一下简要回顾.一、累乘法例1.已知数列{an}满足a1=1,an=a1+2a2+3a3+…+(n-1)an-1(n≥2),则{an}的通项公式an=分析:本题为求数列通项问题,从设问形式上为分段形式,容易使人联想到公式:an=然而从题设条件上看并不具备使用 The “superposition method” and “incremental multiplication method” are highly favored in the issue of the college entrance examination series, especially when solving the general formula of the series, its position becomes more prominent. Let’s do a brief review. Multiply Multiplication Rule 1. Known sequence {an} satisfies a1=1, an=a1+2a2+3a3+...+(n-1)an-1(n≥2), then the general term an of the {an} analysis : This question is to solve the general problem of series, from the question form to the form of subsection, it is easy to think of the formula: an = However, from the perspective of the terms do not have to use