Bonjour pouvez-vous m’aider pour ces 3 calcule merci d’avance ❤️ 39 Calculer A= 5/2 + 3/4 + -7/8 B= 4/15 + 2/5 - 7/30 40 Recopier et compléter les égalités suiv

Réponse :

Explications étape par étape

Bonjour

39 Calculer

A= 5/2 + 3/4 + -7/8

A = (5 x 4)/(2 x 4) + (3 x 2)/(4 x 2) - 7/8

A = 20/8 + 6/8 - 7/8

A = 19/8

B= 4/15 + 2/5 - 7/30

B = (4 x 2)/(15 x 2) + (2 x 6)/(5 x 6) - 7/30

B = 8/30 + 12/30 - 7/30

B = 13/30

40 Recopier et compléter les égalités suivantes

A= 5/8 + 11/6 = .../24 + .../24 = .../...

A = (5 x 3)/(8 x 3) + (11 x 4)/(6 x 4)

A = 15/24 + 44/24

A = 59/24

B= 7/30 + 2/12 = .../60 + .../60 = .../...

B = (7 x 2)/(30 x 2) + (2 x 5)/(12 x 5)

B = 14/60 + 10/60

B = 24/60

B = (2 x 12)/(5 x 12)

B = 2/5

41 calculer

A = 5/4 + 1/6

A = (5 x 3)/(4 x 3) + (1 x 2)/(6 x 2)

A = 15/12 + 2/12

A = 17/12

B = 7/15 - 3/10

B = (7 x 2)/(15 x 2) - (3 x 3)/(10 x 3)

B = 14/30 - 9/30

B = 5/30

B = 5/(5 x 6)

B = 1/6

C = 5/8 + 5/12

C = (5 x 3)/(8 x 3) + (5 x 2)/(12 x 2)

C = 15/24 + 10/24

C = 25/24