Question

A) (+5).(+3)
B) (+4).(-5)
c) (-8).(+ 4) =
D) (-6).(- 7) =
E) (-2).(+4) • (+3) • (-1) =
F) (-5).(-6).(-2) =
G) 2.(-3).(+6) =
H) (- 77) + (+11) =​

Answer 1

Resposta:

(a) +15

(b) -1

(c) -4

(d)+13

Answer 2

A) (+5).(+3) = 15

B) (+4).(-5)= - 20

c) (-8).(+ 4) = - 32

D) (-6).(- 7) = 42

E) (-2).(+4) • (+3) • (-1) =

( - 8) • ( - 3)

24

F) (-5).(-6).(-2) =

( + 30) • ( - 2)

- 60

G) 2.(-3).(+6) =

- 6 • ( + 6)

- 36

H) (- 77) + (+11) =

- 77 + 11

- 66

Regra dos sinais:

( + ) • ( + ) = +

( - ) • ( - ) = +

( - ) • ( + ) = -

( + ) • ( - ) = -