Réponse:
salut
Exsercice2:
A= 2/3 - 5/4 = 2/3×4 - 5/4×3 = 8/12 - 15/12 = -7/12
B= 35/8 × 28/25 = 980/200
C= 2/15 ÷ 12/21 = 2/15 × 21/12 = 42/180
D= 8/7 × 15/2 - 4/7 = 120/14 - 4/7 = 120/14 × 7 - 4/7 × 14 = 840/98 - 56/98 = 784/98
Explications étape par étape:
voilà
