Question

设A为三阶矩阵,|A|=a,则其伴随矩阵A^*的行列式|A*|=( ) A.a B.a^2 C.a^3 D.a^4

Answer 1

知识点: |A*| = |A|^(n-1)

所以 |A*| = |A|^(3-1) = |A|^2 = a^2

B 正确