Calcule as expressões e marque a opção que corresponde as respostas corretas: a) 12 – 8 : 4 + 16 : (–8) = b) 7 • 8 – 12 : (–3) = c) –3 + 4 : (–2) – (–3) • 5 = d) (–1) • 5 + 5 : (–5) – (–4) = *