Ejercicio 9 (J-2004-4 UNED)

Dadas las matrices
$A = \left( \begin{array}{cc} 1 & -1 \\ 2 & 0 \\ 3 & 0 \end{array} \right) \qquad B = \left( \begin{array}{ccc} 1 & 2 & -1 \\ 0 & 3 & -1 \end{array} \right)$
calcula $A \cdot B$