Mathematics, 18.06.2021 16:10 Sourcandy

Hãy tính các định thức sau và cho biết khi nào ma trận tương ứng khả nghịch? $\left[\begin{array}{ccc}1&a^{2} &a\\a&1&a^{2}\\a^{2}&a&1\end{array}\right]$

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