Cho hai ma trận . $A=\left[\begin{array}{ccc}\mathrm{ }\mathrm{ }\mathrm{ }1& 2& 1\\ -2& 0& 1\end{array}\right],B=\left[\begin{array}{ccc}1& 1& \mathrm{ }\mathrm{ }\mathrm{ }0\\ 2& 3& -1\\ 0& 2& \mathrm{ }\mathrm{ }\mathrm{ }0\end{array}\right]$ Khẳng định nào là đúng

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