Réponses

2013-11-20T14:05:57+01:00
3/7+5/2=6/14+35/14=41/14

-5/3+7/8=-40/24+21/24=-19/24

-8/5-5/3=-24/15-25/15=-49/15

1/9-(-7/4)=1/9+7/4=4/36+63/36=67/36