We first introduce methods of finding the sum of the first n terms for an arithmeticsequence of higher order.
我们首先介绍了高阶等差数列前 n 项和的求解方法。
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We first introduce three methods of finding the sum of the first n terms for an arithmeticsequence of higher order, and then display another method by some formal derivatives of which are defined.
Based on the arithmetic of differential protection and simulation technique, this paper analyses the influence of the negative sequence to power system.