2. Resolva as expressões numéricas: a. 38 – { 30 – [ 14 – ( 20 – 5 x 3) ] - 7} = b. 18 + { 22 + [ 7 + ( 4 x 5 – 5) ] – 8} = c. 39 – { 5 + [ ( 6 x 4 – 6) + 9 ]} + 10 = d. 6 + { 3 + [ ( 7 x 3 – 4) + 4]} = e. { 12 + [ 3 x ( 2 + 5 x 6 ) + 2 x ( 4 x 4) ]} = f. 6 + { 19 – [ ( 9 – 10 ÷ 2) x 3] } = g. { 20 + [ 8 x ( 10 ÷ 5) ] – 16} = h. 4 x { 18 + [ 16 + ( 32 ÷ 8 + 6) ] – 10 } =