用蒙特卡洛模拟的方法计算美式期权的价格以及基本描述,复化三点Gauss-lengend公式求pi，随机调制信号下的模拟ppm。- Monte Carlo simulation method of calculating the American option price and basic descr iption, Complex of three-point Gauss-lengend the Formula pi, Random ppm modulated analog signal un