Bonjour j'ai besoin d'aide pour l'exercice 9

Bonjour,

a. 43/10 + 5/10= 48/10 = (2 x 24) / (2 x 5) = 24/5

b. 6/12 + 2/24 = (6 x 2) / (12 x 2) + 2/24 = 12/24 + 2/24 = 14/24 = (2 x 7) / (2 x 12) = 7/12

c. 6/5 + 2/15 = (6 x 3) / (5 x 3) + 2/15 = 18/15 + 2/15 = 20/15 = (5 x 4) / (5 x 3) = 4/3

d. 1/30 + 2/3 = 1/30 + (2 x 10) / (3 x 10) = 1/30 + 20/30 = 21/30 = (3 x 7) / (3 x 10) = 7/10.