E = (+12) – (–6) + (–2) +(+7) – (+8)
F = (–20) – (+14) + (+40) + (–12) – ( -10)
G = (–7,1) – (–3,2) – (+1,5) + (+8,4)
H = (+1) – (–6,8) + (–10,4) + (+7,7) - (+2)
merci d'avance.