中文说明：黄金分割法求极小值 功能：用黄金分割法求f(x)在区间[a，b]上的近似极小值。当且仅当f(x)在[a，b]上为单峰时次方法适用
English Description：
Golden section method for minimum function: use golden section method to find the approximate minimum value of F (x) in the interval [a, b]. If and only if f (x) is a single peak on [a, b], this method is applicable