此程序实现了利用牛顿迭代法解方程的算法，重要的是利用牛顿迭代法的基本原理，通过编程算出了最后的解-This program implements the algorithm using Newton iterative method of solving equations, newton method basic principle, be programmed to calculate the final solution

求解一元二次方程的解，可以选择通过二分法，迭代法或牛顿迭代法求解-Solution for solving a quadratic equation, you can choose by dichotomy, iterative method or Newton iterative method for solving