若<img class=jc-formula data-tex=n src=https://huaweicloudobs.ahjxjy.cn/6593C84B94B8062EB35F270378D7D9B6.png style=vertical-align: middle;/>阶矩阵<img class=jc-formula data-tex=A,B src=https://huaweicloudobs.ahjxjy.cn/34D561CE3766023EB67E597F39453619.png style=vertical-align: middle;/>,则必有<img class=jc-formula data-tex={ (AB) }^{ -1 }={ B }^{ -1 }{ A }^{ -1 } src=https://huaweicloudobs.ahjxjy.cn/30144CB1D80CED8D250E864433F6EDFA.png style=vertical-align: middle;/>