请各路大侠帮忙1、设4阶矩阵A=(aij)=(a1,a2,a3,a4),B=(a4,a3,a2,a1),P1=(0,0,
请各路大侠帮忙
1、设4阶矩阵A=(aij)=(a1,a2,a3,a4),B=(a4,a3,a2,a1),
P1=(0,0,0,1;
0,1,0,0;
0,0,1,0;
1,0,0,0)
P2=(1,0,0,0;
0,0,1,0
0,1,0,0
0,0,0,1)
其中A可逆,则B-1等于( ).
A.A-1P1P2 B.P1A-1P2 C.P1P2 A-1 D.P2A-1P1
2、设3阶方阵A,B满足关系式AXA=6A+XA,且
A=(1/3,0,0
0,1/4,0
0,0,1/7)
则X=?