Question

(-13)+(+13)
(-15)+(+19)
(-126)+(+48)
(+450)+(-300)
(-500)+(+600)
(+7)+(-7)
(+125)+(-125)
(-13)+(+13)

Answer 1

Resposta:

Deve-se fazer as regras dos sinais:

-13+13 = 0

-15+19 = 4

-126+48 = -78

+450-300 = 150

-500+600 = 100

+7-7 = 0

+125-125 = 0

-13+13 = 0