求道逆矩阵的计算
1 0 2 1 0 0 1 0 2 1 0 0 0 0 1 1 1 -1 0 0 1 1 1 -1
0 1 0 0 1 0 = 0 1 0 0 1 0 = 0 1 0 0 1 0 =0 1 0 0 1 0 =
1 1 1 0 0 1 1 0 1 0 -1 1 1 0 1 0 -1 1 1 0 0 -1 -2 2
【1】③-②【2】①-③【3】③-①【4】①与③交换，上面没有写出
-1 -2 2
A的逆矩阵= 0 1 0
1 1 -2
1 -4 -3 1 0 0 1 -4 -3 1 0 0 1 0 -3 5 -4 0 1 0 0 2 2 3
1 -5 -3 0 1 0 = 0 -1 0 -1 1 0 = 0 -1 0 -1 1 0 = 0 1 0 1 -1 0
-1 6 4 0 0 1 0 2 1 1 0 1 0 0 1 -1 2 1 0 0 1 -1 2 1
【1】②-①，③+①【2】①-②*4，③+②*2【3】①+③*3，②*(-1)
2 2 3
B的逆阵= 1 -1 0
-1 2 1
1 2 1 0 1 2 1 0 1 0 5 -2
= =
2 5 0 1 0 1 -2 1 0 1 -2 1
【1】②-①*2【2】①-②*2
5 -2
C的逆矩阵=
-2 1