Respuesta:
m-------n-------m•n-------m+n
(12)----(-7)-----(-84)------(5)
(-6)----(-14)----(84)-------(-20)
(-5)-----(-8)----(40)-------(-13)
(-10)----(-3)----(30)-------(-13)
(9)-------(-5)----(-45)------(4)
(-15)-----(6)-----(-90)------(-9)
Espero te ayude. : )
