Question

50-2.{7+8:2-[9-3.(5-4)]}

Answer 1

50 - 2.{7+8:2-[9-3.(5-4)]} =
50 - 2.{7+8:2-[6.1]} =
50 - 2.{7+8:2-6} =
50 - 2.{7+4-6} =
50 - 2.5 =
50 - 10 =
40

Espero ter ajudado!