用多种方法求解美式期权定价问题，其中包括二叉树方法，有限差分法，最小二乘蒙特卡洛模拟法（LSM法），并对这几种方法进行了对比(Several methods are used to solve American option pricing problems, including binary tree method, finite difference method, least squares Monte Carlo simulation method (LSM method). These