我们首先介绍了高阶等差数列前 n 项和的求解方法。
We first introduce methods of finding the sum of the first n terms for an arithmetic sequence of higher order.
并研究了付款额呈高阶等差数列及倒虹式年金等某些特殊的年金变化形式，给出了其期初值和期末值。
Some special patterns of annuity changes whose payments are of the arithmetic progression of higher order or of the reverse rainbow are studied, and their beginning values and ending values are given.
首先，简要介绍了三种主要的求和方法。然后，根据高阶等差数列通项的特性，利用新定义的形式导数列对其进行了有效的探讨。
We first introduce three methods of finding the sum of the first n terms for an arithmetic sequence of higher order, and then display another method by some formal derivatives of which are defined.
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