Bonjour,
Calculer:
A = 4/5 - (7/10 - 5/6)
→ Trouvons un dénominateur commun:
4/5 = (12 x 4) / (12 x 5) = 48/60
7/10 = (6 x 7) / (6 x 10) = 42/60
5/6 = (10 x 5) / (10 x 6) = 50/60
A = 48/60 - (42/60 - 50/60)
A = 48/60 - (-8/60)
A = 48/60 + 8/60
A = 56/60
56/60 = (56/4) / (60/4) = 14/15
A = 14/15
Bonne journée.
