四种方法（进退法，黄金分割法，斐波那契法，二次多项式差值法）求解单峰值函数极小值。 本程序已经给定三种目标函数，可以自行添加或者更改。-Four methods (advance and retreat method,Golden section method , Fibonacci method, quadratic polynomial difference method) for solving single peak function minimum. This procedur