Resposta :
Resposta:
a)(-20).(+4)= -80
b)(-8).(-7)= 56
c)(+23).(+3)= 69
d)(+2).(-27)= -54
e)(-40):(+2)= -20
f)(+20):(-4)= -5
g)(-18):(-3)= 6
h)(+36):(+4)=9
Resposta:
a)(-20).(+4)= -80
b)(-8).(-7)= 56
c)(+23).(+3)= 69
d)(+2).(-27)= -54
e)(-40):(+2)= -20
f)(+20):(-4)= -5
g)(-18):(-3)= 6
h)(+36):(+4)=9