Bonsoir
14/16 = (2 x 7) / (2 x 8) = 7/8
36/24 = (12 x 3) / (12 x 2) = 3/2
35/45 = (5 x 7) / (5 x 9) = 7/9
4/8 = (4 x 1) / (4 x 2) = 1/2
70/90 = (10 x 7) / (10 x 9) = 7/9
3) Soient x le prix d'un pain au chocolat, donc on a :
(3 * 1,20) + (5 * x) = 10,35
3,60 + 5x = 10,35
5x = 10,35 - 3,60
5x = 6,75
x = 6,75/5
x = 1,35
Un pain au chocolat coûte 1,35 €
