Resposta:
[tex]( \frac{ - 3}{4} ) \times( \frac{ - 2}{5} ) \\ - \frac{3}{4} \times ( \frac{ - 2}{5} ) \\ \frac{3}{4} \times \frac{2}{5} \\ \frac{3}{2} \times \frac{1}{5} \\ \frac{3}{10} [/tex]
