4-r1-r2,r3-2r1,r1-2r2
0 -3 3 -1 -6
1 1 -2 1 4
0 -4 4 -4 0
0 6 -6 5 3
r4+2r1,r3*(-1/4),r1+3r3,r2-r3
0 0 0 2 -6
1 0 -1 0 4
0 1 -1 1 0
0 0 0 3 -9
r1*(1/2),r3-r1,r4-3r1
0 0 0 1 -3
1 0 -1 0 4
0 1 -1 0 3
0 0 0 0 0
交换行
1 0 -1 0 4
0 1 -1 0 3
0 0 0 1 -3
0 0 0 0 0