Respuesta:
[tex]( - 3 \frac{1}{4} xy)( - \frac{2}{4} {x}^{2} - 5x {y}^{2} + 4 - {x}^{2} {y}^{2}) [/tex]
[tex]( - \frac{13}{4} xy)( - \frac{1}{2} {x}^{2} - 5x {y}^{2} + 4 - {x}^{2} {y}^{2})[/tex]
[tex] \frac{13}{8} {x}^{3} y + \frac{65}{4} {x}^{2} {y}^{3} - \frac{52}{4} xy + \frac{13}{4} {x}^{3} {y}^{3} [/tex]
[tex] \frac{13}{8} {x}^{3} y + \frac{65}{4} {x}^{2} {y}^{3} - 13xy + \frac{13}{4} {x}^{3} {y}^{3} [/tex]
