实现了两种求解非线性问题的数值计算方法：改进欧拉法和增量牛顿迭代法。
Two calculational methods for nonlinear analysis are adopted, that is, the improved Euler method and the Newton iteration method.
根据地图投影变换原理，提出了一种新的地图投影变换方法，即牛顿迭代法。
This paper provides a new method for coordinate transformation between these two types and based on Newton's iterative method, which is derived from map projection principle.
借助牛顿公式和韦达定理，采用迭代的方法求解类似于自然数等幂和的问题。
With the help of Newton formula and Vieta theorem, iterative method was used to solve problems of power sum.
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