secant method and Newton-Lagrange method

二分法，牛顿迭代法，割线法，梯形积分法和辛普森积分法在C语言程序设计实现-Dichotomie，Newton Iteration,Secant Method,trapezoidal integration and Simpson s rule in the C languare programing.

非线性方程求根，包括二分法，迭代法和弦割法-The roots of nonlinear equations, including the dichotomy, iterative method of chord secant method