Question

Exercícios propostos

1. Efetue as adições e subtrações abaixo.

a) −9 + 7 = e) 7 − 20 + 3 − 1 =

b) 4 − 10 = f) 6 − (−2) =

c) −5 + 11 = g) −15 − (−1) + (−2) =

d) −2 − 3 − 4 = h) −30 + (−5) + (+10) =​

Answer 1

Resposta:

a) −9 + 7 = -2

b) 4 − 10 = - 6

c) −5 + 11 = 6

d) −2 − 3 − 4 = -9

e) 7 − 20 + 3 − 1 = -11

f) 6 − (−2) = 6 + 2 = 8

g ) −15 − (−1) + (−2) = -16

h) −30 + (−5) + (+10) = - 30- 5 + 10 = -25