Question

{-3 + [(- 1/2 + 3/4) - ( 2 - 1/2)]} resolva

Answer 1

{-3 + [(- 1/2 + 3/4) - ( 2 - 1/2)]} 

{-3 + [(- 2 + 3)/4 - ( 4 - 1)/2]} 

{-3 + [ 1/4 - 3/2]} 

{-3 + [ (1 - 6)/4]} 

{ - 3 - 5/4 } 

- 12 - 5 ==> - 17
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