Câu 2:

Cho $A=\left( {\begin{array}{*{20}{c}}1&0&0\\2&1&0\\3&{ - 1}&2\end{array}} \right)$. Tính $\det \mathop {{\rm{[}}\mathop {(3A)}\nolimits^{ - 1} )}\nolimits^T$

Câu 2:

Cho A=\left( {\begin{array}{*{20}{c}}1&0&0\\2&1&0\\3&{ - 1}&2\end{array}} \right). Tính $\det \mathop {{\rm{[}}\mathop {(3A)}\nolimits^{ - 1} )}\nolimits^T$