Bonjour, en 5ème, besoin de votre aide pour calculer les expressions suivantes: A= 5/3 + 3/5 + 2/3 = B= 7/9 x 4/5 = C= 42/72 x 24/35 = D = (5/4 + 5/3) x (4/5 +

Bonjour,

Calculer les expressions suivantes :

A= 5/3 + 3/5 + 2/3

A =  (5 x 5) / (3 x 5) + (3 x 3) / (5 x 3) + (2 x 5) / (3 x 5)

A = 25/15 + 9/15 + 10/15

A = 44/15

B= 7/9 x 4/5

B = 28/45

C= 42/72 x 24/35

C = 1 008/2 520

C = (504 x 2) / (504 x 5)

C = 2/5

D = (5/4 + 5/3) x (4/5 + 2/15)

D = [(5 x 3) / (4 x 3) + (5 x 4) / (3 x 4)] x [(4 x 3) / (5 x 3) + 2/15]

D = (15/12 + 20/12) x (12/15 + 2/15)

D = 35/12 x 14/15

D = 490/180

D = (10 x 49) / (10 x 18)

D = 49/18

E = 10/7 - 3/7 x 3/2

E = (10 x 2) / (7 x 2) - 9/14

E = 20/14 - 9/14

E = 11/14.

Réponse :

Explications étape par étape

Bonjour

calculer les expressions suivantes:

A= 5/3 + 3/5 + 2/3

A = 7/3 + 3/5

A = 35/15 + 9/15

A = 44/15

B= 7/9 x 4/5

B = 28/45

C= 42/72 x 24/35

C = (6 x 7)/(6 x 12) x 24/35

C = 7/12 x 24/35

C = 7/35 x 24/12

C = 1/5 x 2

C = 2/5

D = (5/4 + 5/3) x (4/5 + 2/15)

D = (15/12 + 20/12) x (12/15 + 2/15)

D = 35/12 x 14/15

D = 35/15 x 14/12

D = 7/3 x 7/6

D = 49/18

E = 10/7 - 3/7 x 3/2

E = 10/7 - 9/14

E = 20/14 - 9/14

E = 11/14