2) Efetue as adições abaixo, aplicando a Regra acima:

a) (–3) + (+6) = f) (+25) + (–7) = k) (+5) + (–23) =

b) (+2) + (–5) = g) (–17) + (+36) = l) (+7) + (–4) =

c) (+5) + (–4) = h) (–21) + (+16) = m) (–21) + (+13) =

d) (–5) + (+9) = i) (–4) + (+8) = n) (+28) + (–34) =

e) (+17) + (–12) = j) (+12) + (–27) = o) (–7) + (+4) =​