设A是n阶矩阵,满足AA^T=E(E是n阶单位矩阵),A^T是A的转置矩阵,且|A|
问题描述:
设A是n阶矩阵,满足AA^T=E(E是n阶单位矩阵),A^T是A的转置矩阵,且|A|
答
|A+E| = |A+AA^T|
= |A||E+A^T|
= |A||E+A|
所以 |A+E| = 0.