Bonjour pourriez vous m’aidez ces tout petits calcules de maths svp ? juste l’exercice 70. Merci bcp si vous m’aidez !

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

Réponse:

I=25/21 - 4/7+1/7=16/21

J=25/21-(4/7+1/7)=40/21

K=7/5-(7/15+7/45)=7/9

L=2-(7/8-1/3)=35/24