Question

{[5-2:8-(2-7-4:2)]-1}

Answer 1

{[5-4-(-7)]-1}
{[1+7]-1}
8-1
7
Espero ter ajudado

Answer 2

{[5-2:8-(2-7-4:2)]-1}
     {[5-2:8+7]-1}
       {11,75 - 1}  = 10,75