设A为5阶方阵,且[A]=1/2,(-3A*)^-1=

问题描述:

设A为5阶方阵,且[A]=1/2,(-3A*)^-1=

(-3A*)^-1
= (-1/3) (|A|A^-1)^-1
= (-1/3) (2 A)
= -2/3 A.