Resposta:

Simplificando -36/15 = -12/5

simplificando -50/12 = -25/6

[tex]\frac{-36}{15} .\frac{-50}{12} =\frac{-12}{5} .\frac{-25}{6} =\frac{-12.(-25)}{5.6} =\frac{+300}{+30} =10[/tex]