me ajudem POR FAVOR!! isso é pra AMANHÃ!!

a) 1 x (1 + 7) - 16 : (1 + 3) =

b) 7 x (9 + 5) - 12 : (4 + 2) =

c) 2 x (7 + 1) - 32 : (7 + 9) =

d) 9 x (3 + 7) - 30 : (9 + 6) =
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