解线性方程组多元一次 水平有限，DOS界面。其中，输出方程组的未知数用x1,x2,x3...表示，可以解出多元一次方程。-solving linear equations yuan a limited, and DOS interface. Within this total, output equations with the unknown x1, x2, x3 ... that the United States can come up with multiple linear equ