1) Calcule as expressões numéricas:

a) 12 + [35 - (10 + 2) +2] =

b) [(18 + 3 · 2) ÷ 8 + 5 · 3] ÷ 6 =

c) 37 + [-25 – (-11 + 19 – 4)] =

d) 60 ÷ {2 · [-7 + 18 ÷ (-3 + 12)]} – [7 · (-3) – 18 ÷ (-2) + 1] =

e) -8 + {-5 + [(8 – 12) + (13 + 12)] – 10} =

f) 3 – {2 + (11 – 15) – [5 + (-3 + 1)] + 8} =​