Question

calcule

a) (-1)-(-19)

b) (+13)-(+20)

c)(+20)-(+9)



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Answer 1

Resposta.

A) 18

B) 7

C) 11

Answer 2

Resposta:

sinais iguais soma

sinais diferentes subtrai

a) (-1)-(-19)

-1 + 19 = 18

b) (+13)-(+20)

+13 - 20 = -7

c) (+20)-(+9)

+20 - 9 = 11