Question

(-1).(-3).(+15) sobre (.5).(-10)

Answer 1

$\frac{(-1) * (-3) * (15)}{(5) * (-10)} = \frac{3*15}{(-50} = \frac{45}{-50}$

Answer 2

$\frac{(-1).(-3).(+15)}{(5).(-10)} = \frac{3.15}{-50}= -\frac{45}{50} = - \frac{9}{10}$

Espero ter ajudado.