Question

45+[(8.5-10:2)+(18:2-2)]

Answer 1

45 + [(8 . 5 - 10 : 2 ) + (18 : 2 - 2 )]
45 + [(40 - 5 ) + ( 9 - 2 )]
45 + [35 + 7]
45 + 42 = 87

Answer 2

45 + [(8.5-10:2)+(18:2-2)] =
45 + [(40 - 5)+(9-2)] =
45 + [(35 + 7)] =
45 + 42
87

Espero ter ajudado!