如果 <img class=jc-formula data-tex=A src=https://huaweicloudobs.ahjxjy.cn/53F870B8D448BB3DB08A67264B6329F9.png style=vertical-align: middle;/>,<img class=jc-formula data-tex=B src=https://huaweicloudobs.ahjxjy.cn/4CEB8696C01DCD0803D103905D21BDE4.png style=vertical-align: middle;/>,<img class=jc-formula data-tex=AB src=https://huaweicloudobs.ahjxjy.cn/6057A50A3760047224EFE95A9FC4F34E.png style=vertical-align: middle;/>都是对称矩阵,那么<img class=jc-formula data-tex=AB=BA src=https://huaweicloudobs.ahjxjy.cn/1A64F48C2D1428E68BA3ECF27171E777.png style=vertical-align: middle;/>.