Resposta :
A)(+7)×(+8)=+56
7×8
+ × += +
7×8=56
B)(-6)×(-4)=+24
- × -= +
6×4=24
C)(-7)×(-8)=+56
- × -= +
7×8=56
D)(-5)×(+9)=-45
- × += -
5×9=45
E)(+7)×(-8)=-56
+ × -= -
7×8=56
F)(+4)×(-8)=-32
+ × -= -
4×8=32
G)(-7)×(+8)=-56
- × += -
7×8=56
A)(+7)×(+8)=+56
7×8
+ × += +
7×8=56
B)(-6)×(-4)=+24
- × -= +
6×4=24
C)(-7)×(-8)=+56
- × -= +
7×8=56
D)(-5)×(+9)=-45
- × += -
5×9=45
E)(+7)×(-8)=-56
+ × -= -
7×8=56
F)(+4)×(-8)=-32
+ × -= -
4×8=32
G)(-7)×(+8)=-56
- × += -
7×8=56