Réponse :
EXERCICE 1
A = 2/3 + (2 - 7/3) + (2 - 3/4)
A = (2x4)/(3x4) + [(2x12)/(1x12) - (7x4)/(3x4)] + [((2x12)/(1x12) - (3x3)/(4x3)]
A = 8/12 + (24/12 - 28/12) + (24/12 - 9/12)
A = 8/12 - 4/12 + 15/12 = 23/12 - 4/12 = 19/12
Explications étape par étape
