求简单矩阵化简

1、
6 -5 |-2
5 6 |-22
6r2-5r1,
6.-5.-2
0.61.-122
r2/61,r1+5r2
6.0.-12
0.1.-2
r1/6
1.0.-2
0.1.-2
2,
7/6 -3/4 |4
1/6 7/4 |8
r1*12,r2*12
14.-9.48
2.21.96
7r2-r1,
14.-9.48
0.156.454

1、
6 -5 -2
5 6 -22

r1-r2
1 -11 20
5 6 -22

r2 - 5r1
1 -11 20
0 61 -122

r2*(1/61)
1 -11 20
0 1 -2

r1+11r2
1 0 -2
0 1 -2

2、
7/6 -3/4 4
1/6 7/4 8

r1*12,r2*12
14 -9 48
2 21 96

r1-7r2
0 -156 -624
2 21 96

r1*(-1/156)
0 1 4
2 21 96

r2-21*r1
0 1 4
2 0 12

r2*(1/2),r1<->r2
1 0 6
0 1 4

3、
5 -9 -10
15 -27 -20

r2-3r1
5 -9 -10
0 0 10

r1+r2,r2*(1/10),r1*(1/5)
1 -9/5 0
0 0 1

4、
2/3 1 3
1/2 3/4 9/4

r1*3,r2*4
2 3 9
2 3 9

r2-r1,r1*(1/2)
1 3/2 9/2
0 0 0

5、求ab
1 0 a
0 1 b
求ab? 不是吧.