Question

-{[(-5-1)+1+9]+2} -1-{[(4-5)-6+7]}

Answer 1

Boa tarde!

-{[(-5-1)+1+9]+2} -1-{[(4-5)-6+7]}
-{[-6+1+9]+2}-1-{[-1-6+7]}
-{[-5+9]+2} -1-{[-7+7]}
-{4+2} -1-{0}
-{6} -1 - 0
-6 -1 - 0
-7-0 = -7

Att:Guilherme Lima

Answer 2

- {[(-5-1) + 1 + 9] + 2} - 1 - {[(4-5) -6+7]} =
- {[-6+1+9] + 2 } -1- {-1-6+7]} =
- { 4 + 2} - 1 - {0} =
- {6 } -1 - 0 =
-6 -1 - 0 = 
-7

Resposta: -7