Réponse :
A = 5/7 ÷ 15/2 ⇔ A = (5 x 2)/(7 x 15) = 2/21
B = 4/3 ÷ 7/9 ⇔ B = (4 x 9)/(3 x 7) = 12/7
C = 12/5 ÷ 6/7 ⇔ C = (12 x 7)/(5 x 6) = 14/5
D = 9/2 ÷ 3/4 ⇔ D = (9 x 4)/(2 x 3) = 6/1
E = 3/5 ÷ - 9/25 ⇔ E = (3 x 25)/(5 x (-9)) = - 5/3
F = 7/16 ÷ 5/4 ⇔ F = (7 x 4)/(16 x 5) = 7/20
Explications étape par étape