Question

{[(-60-40)+21+19}+20}+20-10

Answer 1

{[-100 + 21+19]+ 20} + 20-10

{ -60 + 20} + 10

-40 + 10

-30


R = -30

Answer 2

{[(-60-40)+21+19]+20}+20-10
{[- 100+ 40]+20}+10
{- 60+20}+10
-40 +10
-30

Resposta: -30