设<img src="https://static.zxtiku.com/wangke/imgs/topic/36e3081630d126843e8fe3a9460a929a.png"/>都是<img src="https://static.zxtiku.com/wangke/imgs/topic/963d7579fc69197c34bd278646b995dc.png"/>阶方阵，且<img src="https://static.zxtiku.com/wangke/imgs/topic/4c3f37ceb30db810e964973099d42015.png"/>，则<img src="https://static.zxtiku.com/wangke/imgs/topic/ed48d7ca6a0ae8ec7d8b519cbf08ea8e.png"/> （）.