Réponse :
Explications étape par étape
Bonsoir
Exercice 70
I = 25/21 - 4/7 + 1/7
I = 25/21 - 3/7
I = 25/21 - (3 x 3)/(7 x 3)
I = 25/21 - 9/21
I = 16/21
J = 25/21 - (4/7 + 1/7)
J = 25/21 - 5/7
J = 25/21 - (5 x 3)/(7 x 3)
J = 25/21 - 15/21
J = 10/21
K = 7/5 - (7/15 + 7/45)
K = 7/5 - [(7 x 3)/(15 x 3) + 7/45]
K = 7/5 - (21/45 + 7/45)
K = 7/5 - 28/45
K = (7 x 9)/(9 x 5) - 28/45
K = 63/45 - 28/45
K = 35/45
K = (7 x 5)/(9 x 5)
K = 7/9
L = 2 - (7/8 - 1/3)
L = 2 - [(7 x 3)/(8 x 3) - (1 x 8)/(3 x 8)]
L = 2 - (21/24 - 8/24)
L = 2 - 13/24
L = 48/24 - 13/24
L = 35/24
