Question

{(-3+1/2) +[(-3-1/2)x2-3x1/4]}​

Answer 1

$(-3+\frac{1}{2}) +[(-3-\frac{1}{2})\times2-3\times\frac{1}{4}]\\-2,5 +[-3,5\times2-0.75]\\-2,5 +[-7-0.75]\\-2,5 +(-7.75)\\-2,5 -7.75\\-10.25$

Bons estudos! :D