高斯消去法适用于求解低阶线性方程和方程组，它先逐次消去变量，将方程组化成同解的上三角形方程组，然后按方程相反顺序求解上三角方程组，得到原方程组的解-Gaussian elimination method for solving linear equations and low-level equations, the successive elimination of its first variable, the equations into a triangle with the solut