Réponse :
Explications étape par étape
Bonjour
Exercice 3 (le deuxième)
A = 4/5 + 7/8
A = (4 x 8)/(5 x 8) + (7 x 5)/(8 x 5)
A = 32/40 + 35/40
A = (32 + 35)/40
A = 67/40
B = 6/5 - 1/20
B = (6 x 4)/(5 x 4) - 1/20
B = 24/20 - 1/20
B = 23/20
C = -36/5 x -25/12
C = 36/12 x 25/5
C = (12 x 3)/12 x (5 x 5)/5
C = 3 x 5
C = 15
D = 3/8 : 9/16
D = 3/8 x 16/9
D = 16/8 x 3/9
D = (2 x 8)/8 x 3/(3 x 3)
D = 2 x 1/3
D = 2/3
