梯形求积公式，指n=1时的牛顿一科特斯公式。
作者想推导简短的公式，对梯形、矩形和圆形断面采用通用的程序，以得到准确的结果。
The authors want to deduce a brief formulation, and use all-purpose program to get exact result for echelon, rectangle and rotundity cross section.
文章推导较简捷的公式，对梯形、矩形和圆形断面，采用通用的计算程序，以期达到准确的计算结果。
In this article, the authors want to deduce a brief formulation, and use all - purpose program to get exact result for echelon, rectangle and rotundity cross section.
用完全初等的方法给出了梯形电阻网络等效电阻的通项公式，并对相关问题进行了讨论。
The general formula of the equivalent resistance of ladder type network are achieved with elementary method, and some relevant problems are discussed.
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