Question

efetue a expressão 15-{8+[12-(5+4)-2]+3}

Answer 1

15-8+12-9-2+3
15-8+1+3
15-12
3

Answer 2

15-{8+[12-(5+4)-2]+3}
15-{8+[12-(+9)-2]+3}
15-{8+[12-9-2]+3}
15-{8+[+1]+3}
15-{8+1+3}
15-{+12}
15-12=+3
resposta : +3