Réponses

2013-02-28T22:26:55+01:00
Tu fais:
15:[(1/4)-(2/3)]
15:[(3/12)-(8/12)]
15:(-5/12)=-36
2013-02-28T22:58:10+01:00
15:[(1/4)-(2/3)]. 15:[(3/12)-(8/12)] 15:(5/12)=-36