Question

40 -[15-(12-3)-8] quando a resposta

Answer 1

40-[15-(12-3)-8]
40-[15-(9)-8]
40-[15-9-8]
40-[6-8]
40-[-2]
40+2
42

Bons estudos!

Answer 2

Resolve Primeiro a conta dos parenteses

40-[15-(12-3)-8]
40-[15-9-8]
40-[-2]
40 + 2 = 42