Réponses

2013-12-04T11:35:29+01:00
A) 5/6 -13/10 - 8/15= (30-39-16) / 30 = -25/30 = -5/6

b) 5/9 - 7/4 +13/12= (20-63+39) / 36 = - 4/36 = - 1/9