Question

resolva as multiplicações:
a) (-3).(+4)=
b) (+6).(-2)=
c) (-9).(-8)=
d) (-2).(-2).(+4)=
e) (-5).(-4).(-3)=
f) (+4).(-6).(-2)=
g) (-2).(-3).(+4)=

Answer 1

a) (-3).(+4)=
- 12

b) (+6).(-2)=
- 12

c) (-9).(-8)=
72

d) (-2).(-2).(+4)=
( + 4) • ( + 4)
16

e) (-5).(-4).(-3)=
( + 20 ) • ( - 3)
- 60

f) (+4).(-6).(-2)=
( - 24) • ( - 2)
48

g) (-2).(-3).(+4)=
( + 6) • ( + 4)
24


Regra dos sinais:

( + ) × ( + ) = +
( - ) × ( - ) = +
( + ) × ( - ) = -
( - ) × ( + ) = -