Réponses

2014-09-21T00:38:50+02:00
1) 7sur 3 - 2 sur 3 × 7 sur 8
=7/3 - 14/24
=7×8/3×8 - 14/24
=56/24 - 14/24
=(56-24)/24
=32/24
=8×4/8×3
=4/3