<p>设A为3阶矩阵，且<img alt="" width="40" height="21" style="width: 100%;height: auto;" src="https://learnfile.20230611.cn/learnAppQuestion/94/fc/94fc36150fb2735c9282792e266118a0.png">则<img alt="" width="91" height="43" src="https://learnfile.20230611.cn/le