1.
第2题不好表示
A=
-1 0 | 2 0
0 -1 | 0 2 -E 2E
------|---- =
0 0 | 4 3 0 A22
B=
2 | 0 -1
1 | 1 0 B11 B12
--|----- =
0 | 1 0 0 E
0 | 0 1
AB =
-B11 -B12+2E
0 A22
=
-2 2 1
-1 -1 2
0 4 3
1.
第2题不好表示
A=
-1 0 | 2 0
0 -1 | 0 2 -E 2E
------|---- =
0 0 | 4 3 0 A22
B=
2 | 0 -1
1 | 1 0 B11 B12
--|----- =
0 | 1 0 0 E
0 | 0 1
AB =
-B11 -B12+2E
0 A22
=
-2 2 1
-1 -1 2
0 4 3