Réponse :
Explications étape par étape
Bonjour
A = 12/5 - 3/5 x 7/9
A = 12/5 - 3/9 x 7/5
A = 12/5 - 1/3 x 7/5
A = 12/5 - 7/15
A = (12 x 3)/(5 x 3) - 7/15
A = 36/15 - 7/15
A = 29/15
B = 3/5 + 7/(10/14) / 5
B = 3/5 + (7 x 14/10)/5
B = 3/5 + (7 x 14)/(10 x 5)
B = 3/5 + (49 x 2)/(2 x 25)
B = 3/5 + 49/25
B = 15/25 + 49/25
B = 64/25
