3+2r4
1 0 1 4
0 1 -1 2
0 0 0 3
0 0 -1 1
r3r4
1 0 1 4
0 1 -1 2
0 0 -1 1
0 0 0 3 此为阶梯形
r4*(1/3),r1-4r4,r2-2r2,r3-r4
1 0 1 0
0 1 -1 0
0 0 -1 0
0 0 0 1
r3*(-1),r1-r3,r2+r3
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1 此为行最简形
3+2r4
1 0 1 4
0 1 -1 2
0 0 0 3
0 0 -1 1
r3r4
1 0 1 4
0 1 -1 2
0 0 -1 1
0 0 0 3 此为阶梯形
r4*(1/3),r1-4r4,r2-2r2,r3-r4
1 0 1 0
0 1 -1 0
0 0 -1 0
0 0 0 1
r3*(-1),r1-r3,r2+r3
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1 此为行最简形