说明：  用于求解线性方程组的高斯消元法，高斯消元法通过将系数矩阵转换成上三角矩阵，从下往上一次求解线性方程组的解
(The Gaussian elimination method is used to solve the linear equations. The Gaussian elimination method converts the coefficient matrix into the upper triangular matrix and solves the solution of the linear equations from bottom to last.)