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

Segue a resolução dos exercícios.

E lembre-se:

NEGATIVO COM NEGATIVO = POSITIVO
NEGATIVO COM POSITIVO = NEGATIVO

POSITIVO COM NEGATIVO = NEGATIVO
POSITIVO COM POSITIVO = POSITIVO

E quando temos, por exemplo, -5-6, estamos "devendo" 5 e 6, logo, devemos 13 (-13).



Espero ter ajudado! ;)

Answer 2

Resposta:

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 = -3 g) (+8) – (+5) = +8 -5 = 3 h) (–8) – (–5) = -8 +5 = -3 i) (–1) – (–1) – (–1) – (+1) = -1 +1 +1 -1= 0 j) (+12) – (+9) + (–4) = +12 -9 -4 = -1 k) (–100) + (+200) – (–300) = -100 +200 +300 = +400 l) (+60) – (–10) – (–40) = +60 +10 +40 = +110 m) (+2) – (+2) – (+2) – (+2) = +2 -2 -2 -2 = -4 n) (–15) + (+18) – (–5) = -15 +18 +5 = 8 o) –(–3) – (–3) – (–3) = +3 +3 +3 = +9 p) –(+3) – (+3) – (+3) = -3 -3 -3 = -9

Explicação passo-a-passo: