改进的黄金分割法（Fibonacci）用于求解非线性方程组的最优化问题，加上后面的main,可以求解一个产量模型最优参数的问题，并给出预测产量和累积产量的曲线。-Improved golden section method (Fibonacci) for solving nonlinear equations optimization problem, with the back of the main, a yield model can solve the problem of optimal parameters and gives predict yield and cumulative yield curve.