Question

Calcule o valor de cada soma algébrica.

a) (+8) + (–5)

b) (–8) + (+5)

c) (+8) + (+5)

d) (–8) + (–5)

e) (+8) – (–5)

f) (–8) – (+5)

g) (+8) – (+5)

h) (–8) – (–5)

i) (–1) – (–1) – (–1) – (+1)

j) (+12) – (+9) + (–4)

k) (–100) + (+200) – (–300)

l) (+60) – (–10) – (–40)

m) (+2) – (+2) – (+2) – (+2)

n) (–15) + (+18) – (–5)

o) –(–3) – (–3) – (–3)

p) –(+3) – (+3) – (+3)

Answer 1

Olá, Eron. (=^.^=)/ 

a) (+8) + (–5) = 8-5 = 3

b) (–8) + (+5) = -8+5 = -3

c) (+8) + (+5) = 8+5 = 13

d) (–8) + (–5) = -8-5 = -13

e) (+8) – (–5) = 8+5 = 13

f) (–8) – (+5) = -8-5 = -13

g) (+8) – (+5) = 8-5 = 3

h) (–8) – (–5) = -8+5 = -3

i) (–1) – (–1) – (–1) – (+1) = -1+1+1-1 = -2+2 = 0

j) (+12) – (+9) + (–4) = 12-9-4 = 12-13 = -1

k) (–100) + (+200) – (–300) = -100+200+300 = -100+500 = 400

l) (+60) – (–10) – (–40) = 60+10+40 = 110

m) (+2) – (+2) – (+2) – (+2) = 2-2-2-2 = 2-6 = -4

n) (–15) + (+18) – (–5) = -15+18+5 = -15+23 = 8

o) –(–3) – (–3) – (–3) = 3+3+3 = 9

p) –(+3) – (+3) – (+3) = -3-3-3 = -9

Regras dos sinais:

+ com + = +
- com- = +
- com + = -
+ com - = -

Bons estudos! :-)

Answer 2

Resposta:

a) +3

b) -3

c) +13

d) -13

e) +13

f) -13

g) +3

h) -3

i) 0

j) -1

k) +400

l) +110

m) -4

n) +8

o) +9

p) -9

Explicação passo-a-passo: