A^(-1)=diag(3,4,7),|A^(-1)|=12*7=84,
|A|=1/84
|E-A|=diag(2/3.3/4.6/7)= 3/7
A(-1)BA = 6A + BA
同乘A
BA=6A^2+ABA
(E-A)B=6A
(E-A)B=6A
两边去行列式
|E-A||B|=|6A|
3/7|B|=216/84
|B|=6
A^(-1)=diag(3,4,7),|A^(-1)|=12*7=84,
|A|=1/84
|E-A|=diag(2/3.3/4.6/7)= 3/7
A(-1)BA = 6A + BA
同乘A
BA=6A^2+ABA
(E-A)B=6A
(E-A)B=6A
两边去行列式
|E-A||B|=|6A|
3/7|B|=216/84
|B|=6