1.
1 0
0 1
2.
0 1 0 5
0 0 1 3
0 0 0 0
3.
1 0 0 5
0 0 1 -3
0 0 0 0
4.
1 -1 0 2 -3
0 0 1 -2 2
0 0 0 0 0
0 0 0 0 0过程1.r2-3r11-10 5r2*(1/5)1-10 1r1+r21 00 12.r2-r1,r3-2r10 2 -3 10 1 -1 20 0 -1 -3r1-2r20 0 -1 -30 1 -1 20 0 -1 -3依次 r2-r1,r3-r1,r1*(-1), r1<->r20 1050 0130 000满意请采纳^_^