Question

1. Resolva as seguintes expressões.

a) -8-[-2-(-12)+3]=

b) 15-(3-2)+(7-4)=

c) 25-(8-5+3)-(12-5-8)=

Answer 1

Resposta: a) -8-[-2-(-12)+3]= -21

b) 15-(3-2)+(7-4)= 17

c) 25-(8-5+3)-(12-5-8)= 20

Answer 2

Resposta:

B) 15-(+1)+(+3)

15-1+3

15+3-1

18-1

17

C) 25-(8-5+3)-(12-5-8)

25-8+5-3-12+5+8

17+2-7+8

19+1

20

OBS: Não consegui resolver a letra A