Réponses

2013-09-07T12:03:23+02:00
2/3+5/3 x 4/7
=7/3 x 4/7
= 28/21
= 4/3

7/30-4/3/5/2
7/30-4/3 x 2/5
7/30-8/15
7/30-16/30
-9/30
-3/10