如何利用行初等变换吧A矩阵变为单位矩阵? 

问题描述:

如何利用行初等变换吧A矩阵变为单位矩阵?
 

r1+r2+r3+r44 0 0 01 1 -1 -11 -1 1 -11 -1 -1 1r1*(1/4),r2-r1,r3-r1,r4-r11 0 0 00 1 -1 -10 -1 1 -10 -1 -1 1r3+r2,r4+r21 0 0 00 1 -1 -10 0 0 -20 0 -2 0r3*(-1/2),r4*(-1/2),r2+r3+r41 0 0 00 1 0 00 0 0 10 0...