Question

a) (−9) . (+6) = _________

b) (−5) . (−4) = _________

c) (+4) . (−8) = _________

d) (+6) . (+7) = ________​

Answer 1

→ Cálculo :

Regra de sinal :

( - ) ( - ) = +

( + ) ( + ) = +

( - ) ( + ) = -

( + ) ( - ) = -

A) ( - 9 ) · ( + 6 ) = -54

B) ( - 5 ) · ( - 4 ) = +20

C) ( + 4 ) · ( - 8 ) = -32

D) ( + 6 ) · ( + 7 ) = +42

Answer 2

a) (−9) . (+6) =

(-9) × 6

-54

b) (−5) . (−4) =

-5 × -4

20

c) (+4) . (−8) =

4 × (-8)

-32

d) (+6) . (+7) =

6 × 7

42