Réponses

2014-09-15T20:04:01+02:00
6/5-17/14/5/7
=6/5-17/14x7/5
=6/5-119/70
=84/70-119/70
=-35/70
=-1/2
3/7-5/7×21/40
=3/7-105/280
 =3/7-3/8
=24/56-21/56
=3/56