考点解答
(1):两边同乘A-1,A-1=[3 -1 5;5 2 -8;-4 -1 6];
X=[10 2;-15 -3;12 4];
(2):两边同右乘A-1,X=[2 -1 -1;-4 7 4];
(1)AX = B
X = A^(-1) * B
=
10 2
-15 -3
12 4
(2)XA = B
X = BA^(-1)
=
2 -1 -1
-4 7 4