Question

Calcule observando as regras dos sinais: a) – 8 + 6 – 1= b) (+8) – (+5)= c) – 13 + 7 – 2 – 8 + 15 – 1= d) – 2 – 4 – 1= e) + 22 – 3 – 14 – 5 + 24 + 12= f) 12 – 7 + 3= g) (– 3) + (+ 9)= h) (– 2) – (– 3) + ( + 5)= i) 4 + 13 – 21= j) (+ 2) + (– 7)=

Answer 1

Resposta:

a) - 3

b) + 3

c) -2

d) -7

e) 36

f) 8

g) 6

h) 6

i)-4

j) -5

Explicação passo-a-passo:

a) – 8 + 6 – 1

-9 + 6 = - 3

b) (+8) – (+5)=

+8 - 5 = + 3

c) – 13 + 7 – 2 – 8 + 15 – 1=

-24 + 22 = -2

d) – 2 – 4 – 1= -7

e) + 22 – 3 – 14 – 5 + 24 + 12=

58 - 22 = 36

f) 12 – 7 + 3=

15 - 7 = 8

g) (– 3) + (+ 9)= 6

h) (– 2) – (– 3) + ( + 5)=

-2 + 3 + 5 =

8 - 2 = 6

i) 4 + 13 – 21=

17 - 21 = -4

j) (+ 2) + (– 7)= -5