Réponses

2013-04-28T14:16:34+02:00

1) 1/3 de 3/5 = 1*3/3*5 = 3/15 = 1/5

2) 3/5+1/3 = 3*3/5*3 + 1*5/3*5 = 9/15+5/15 = 14/15

3) 15/15-14/15 = 1/15