a) \[ A = \begin{pmatrix} 2 & -1 & 3 \\ 1 & 0 & -2 \\ 4 & -3 & 6 \end{pmatrix} \]
b) \[ B = \begin{pmatrix} 3 & 1 & -2 \\ 0 & 4 & 1 \\ 2 & -3 & 5 \end{pmatrix} \]
c) \[ C = \begin{pmatrix} 1 & 2 & 3 \\ 4 & 5 & 6 \\ 7 & 8 & 10 \end{pmatrix} \]
d) \[ D = \begin{pmatrix} 2 & 3 & 1 \\ 1 & 5 & -1 \\ 4 & 7 & 3 \end{pmatrix} \]
e) \[ E = \begin{pmatrix} 6 & 2 & -1 \\ 0 & 5 & 3 \\ 1 & 4 & 2 \end{pmatrix} \]
f) \[ F = \begin{pmatrix} 1 & 0 & 2 \\ 3 & 4 & -1 \\ 5 & -2 & 0 \end{pmatrix} \]
