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$$\large{\displaylines{ \normalsize\begin{array}{l|l} 1 & \mathbf{A}=\begin{pmatrix}3&7&3&0\\4&0&1&3\end{pmatrix}\\ \\ 2 & \mathbf{B}=\begin{pmatrix}3&2&5&-1\end{pmatrix}\\ \\ 3 & \mathbf{C}=\begin{pmatrix}-3\\0\\4\end{pmatrix}\\ \\ 4 & \mathbf{D}=\begin{pmatrix}5\end{pmatrix}\\ \\ 5 & \mathbf{O}=\begin{pmatrix}0&0\\0&0\end{pmatrix} \end{array}}}$$

. . . матрица