A = 5/6 - 1/3 = 5/6 - 2/6 = 3/6 = 1/2
B = -3/4 + 7/24 = -3*6/24 + 7/24 + -18/24 + 7/24 = -11/24
C = -8/45 - 2/5 = -8/45 - 2*9/45 = -8/45 - 18/45 = -26/45
D = 9/14 - 5 = 9/14 - 5*14/14 = 9/14 - 70/14 = -61/14
rassurez vous du calcul au cas j'ai commis une erreu d'inattention
bon courage