任意2阶方阵<img src="https://static.zxtiku.com/wangke/imgs/topic/6cc9bd8ce7dc629be64c6b9c647de1d6.png"/>的第一行的2倍加到第二行得到<img src="https://static.zxtiku.com/wangke/imgs/topic/59ce8e2f517c12cfedfe70fdeea5a134.png"/>. 则 <img src="https://static.zxtiku.com/wangke/imgs/topic/d726bd1115c5166c32012b14f6c1c1e1.png"/>等于