Réponses

2014-10-15T17:40:44+02:00
6/5 - 17/14 : 5/7
= 6/5 - 17/14 x 7/5
= 6/5 - 119/70
= 6 x 10 / 5 x 10 - 119/70
= 60/50 - 119/70
= - 59/70