bjr
2/3 + (1/6) x (4/5) =
on calcule le produit en premier
(1/6) x (4/5) = (1 x 4)/(6 x 5)
= 4 / (6 x 5) (on simplifie par 2)
= 2 / (3 x 5)
2/3 + (1/6) x (4/5) = 2/3 + 2/(3 x 5) dénominateur commun 3x5
= (2 x 5)/(3 x 5) + 2/(3 x 5)
= 10 / 15 + 2 / 15
= 12 / 15 (on simplifie par 3)
= 4/5