completer les egalités
7sur3=?sur15           12sur8=?sur2             3.5sur4=7sur?                 25sur35=5sur?           

2.4sur3.7=?sur37                                  56sur35=8sur?

Répondre :

NWayne
35sur15  3sur2  7sur8  5sur7  24sur37  8sur5
7sur3=?sur15 = 35/15
12sur8=?sur2 = 4/2 = 2/1 = 1
3.5sur4=7sur? = 7/8
25sur35=5sur? = 5/7
2.4sur3.7=?sur37 = 24/37
56sur35=8sur? = 8/5