Question

{[(73-64)+20]-(40-31)}+(-3)

Answer 1

{[(73-64)+20]-(40-31)}+(-3)
={[+ 9+20]-(+9)}-3
={+29-9}-3
=+20-3
=17

Resposta: 17

Answer 2

{[(73-64)+20]-(40-31)}+(-3)
{[(9)+20]-(9)}+(-3)
{[9+20]-9}-3
{[29]-9}-3
{29-9}-3
{20}-3
20-3
17