“←”设 |A(a)=d是一个非零常数.A*(a)为A(a)的伴随矩阵，则A(2)A(a)=A(a)A(a)= E0dA-'(a)==A*(a).. A(a)可逆.S8.1入一矩阵A§8.1 λ─矩阵 “  ” 设 A d ( )  = 是一个非零常数. A ( )  为 的伴随矩阵，则  A( )  1 1 A A A A E ( ) ( ) ( ) ( ) d d       = =  A( )  可逆. 1 1 A A ( ) ( ). d   −  =