Bonjour C’est le numéro 49 ;) 49 Calculer les expressions suivantes. 7 4 4 8 . A= 3 3 5 8 -5 7 C= + 3 6 4 ว 5 7

Bonjour,

Explications étape par étape :

A = 7/3 - 4/3 : 8/5

A = 7/3 - 4/3 x 5/8

A = 7/3 - 4/8 x 5/3

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

A = 7/3 - 1/2 x 5/3

A = 7/3 - 5/6

A = (7 x 2)/(3 x 2) - 5/6

A = 14/6 - 5/6

A = 9/6

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

A = 3/2

B = -4/9 x 1/5 : 3/7

B = -4/45 x 7/3

B = -28/135

C = -8/3 : -5/6 + 7/4

C = -8/3 x -6/5 + 7/4

C = 6/3 x 8/5 + 7/4

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

C = 2 x 8/5 + 7/4

C = 16/5 + 7/4

C = (16 x 4)/(5 x 4) + (7 x 5)/(4 x 5)

C = 64/20 + 35/20

C = 99/20

Réponse :

A = 3/2

B = -28/135

C = 99/20