combien sa fait en simplifiant

10/5 x 3/2 = 2x5x3/5x2 = (les 5 et les 2 s'annulent (on les barre)) = 3/1 = 3
                                                       ou
                                 10/5 x 3/2 = 30/10 = 3/1 = 3

                                                                                  Voila, bonne journée :)