《数值计算方法》中根据给定的一些点的坐标（x,y），使用最小二乘多项式拟合方法，根据用户输入的点坐标及需要拟合出的多项式阶数，实现拟合多项式的系数输出！-" Numerical Methods"　at some point according to the given coordinates (x, y), using the least squares polynomial fitting method, based on user input point coordinates and the need to fit a polynomial order to achieve polynomial fitting coefficient of output!