Задача 5.

Find the following products: 1) $\left( \begin{smallmatrix} 1&2&3 \\ 3&1&2 \end{smallmatrix} \right)\! \left( \begin{smallmatrix}3&1&2 \\ 1&2&3\end{smallmatrix} \right)$; 2) $\left( \begin{smallmatrix}1&2&3&4 \\ 4&3&2&1\end{smallmatrix} \right)\! \left( \begin{smallmatrix}1&2&3&4 \\ 2&1&4&3\end{smallmatrix} \right)$; 3) $\left( \begin{smallmatrix}1&2&4&5&3&6 \\ 1&2&3&4&5&6\end{smallmatrix} \right)\! \left( \begin{smallmatrix}6&4&2&3&5&1 \\ 1&2&3&4&5&6\end{smallmatrix} \right)$; 4) $\left( \begin{smallmatrix}1&2&3&4&5 \\ 2&4&5&3&1\end{smallmatrix} \right)\! \left( \begin{smallmatrix}1&2&3&4&5 \\ 3&5&1&2&4\end{smallmatrix} \right)$; 5) $\left( \begin{smallmatrix}1&2&3&4&5&6 \\ 5&6&1&4&2&3\end{smallmatrix} \right)\! \left( \begin{smallmatrix}1&2&3&4&5&6 \\ 3&4&5&2&6&1\end{smallmatrix} \right)$