Bonjour
a. 2/3 = (2 x 5) / (3 x 5) = 10/15 → Vrai
b. 5 + 9 = 14 → Vrai
c. 7/5 = (7 x 2) / (5 x 2) = 14/10 → Faux
d. 4/3 + 4/5 = (4 x 5) / (3 x 5) + (4 x 3) / (5 x 3) = 20/15 + 12/15= 32/15 → Faux
e. 3 x 7/15 = 21/15 = (3 x 7) / (3 x 5) = 7/5 → Vrai
f. 10/21 x 14/5 = 140/105 = (35 x 4) / (35 x 3) = 4/3 → Vrai
g. 10/3 : 1/3 = 10/3 x 3/1 = 30/3 = 10 → Vrai
h. 5/7 : 2/5 = 5/7 x 5/2 = 10/14 = (2x 5) / (2 x 7) = 5/7 → Faux.
