Réponses

2014-05-13T18:52:12+02:00
7/5 + 7/10 - 9/15
= 7 x 6 / 5 x 6 + 7 x 3 / 10 x 3 - 9 x 2 / 15 x 2
= 42/30 + 21/30 - 18/30
= 63/30 - 18/30
= 45/30
= 15 x 3 / 15 x 2
= 3/2