5+r4, r2+2r1,r3-3r1,r4+4r1
1 0 1 0
0 1 5 7
0 -1 -3 3
0 1 1 1
0 -2 -2 -2
r2-r4,r3+r4,r5+2r4
1 0 1 0
0 0 4 6
0 0 -2 4
0 1 1 1
0 0 0 0
r3*(-1/2),r1-r3,r2-4r3,r4-r3
1 0 0 2
0 0 0 14
0 0 1 -2
0 1 0 3
0 0 0 0
r2*(1/14),r1-2r2,r3+2r2,r4-3r2
1 0 0 0
0 0 0 1
0 0 1 0
0 1 0 0
0 0 0 0
交换行
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1
0 0 0 0