Question

1. Efetue as adições,
a)(+2) + (+3)
b) (+1) + (+8)
c)(+3) + (+11) =
d) (-1) + (-2) =
e) (-3) + (-2)=
f) 0+ (-2) =

Answer 1

Recorde a regra dos sinais:

+ com + = +

- com - = +

- com + = -

a) (+2) + (+3) → 2 + 3 = +5

b) (+1) + (+8) → 1 + 8 = +9

c) (+3) + (+11) → 3 + 11 = +14

d) (-1) + (-2) → -1 - 2 = -3

e) (-3) + (-2) → -3 - 2 = -5

f) 0+ (-2)  → 0 - 2 = -2