Bonsoir,
4/5 + 7/5 = 11/5
2/3- 8/9 = 6/9 -8/9 = -2/9
3/4 +5/12 = 9/12 +5/12 = 14/12 = 7/6
-3/5 + 2/7 = -21/35 + 10/35 = -11/35
2/15 * 40 = 80/15= 16/3
2/3 * -4/5 = -8/ 15
à toi pour l'identité d'Arsène Lupin.
