3 1 -1 2
-5 1 3 -4
2 0 1 -1
1 -5 3 -3
c1-3c2,c3+c2,c4-2c2得
0 1 0 0
-8 1 4 -6
2 0 1 -1
16 -5 -2 7
降阶得:
-8 4 -6
- 2 1 -1
16 -2 7
c1-2c2,c3+c2得
-16 4 -2
- 0 1 0
20 -2 5
降阶得:
-16 -2
- =-(-16×5+2×20)=40
20 5
3 1 -1 2
-5 1 3 -4
2 0 1 -1
1 -5 3 -3
c1-3c2,c3+c2,c4-2c2得
0 1 0 0
-8 1 4 -6
2 0 1 -1
16 -5 -2 7
降阶得:
-8 4 -6
- 2 1 -1
16 -2 7
c1-2c2,c3+c2得
-16 4 -2
- 0 1 0
20 -2 5
降阶得:
-16 -2
- =-(-16×5+2×20)=40
20 5