Bonjour,
on met au même dénominateur:
10/12 + 4/12 = 14/12
9/12 +5/12 = 14/12
21/12 -7/12 = 14/12
7/6 = 14/12
10/8 = 5/4 = 15/12
donc on supprime (5*2)/(4*2)
13/24 +3/24 + 12/24 =28/24 = 14/12
14/12
13/6 - 6/6 = 7/6 = 14/12
40/24 - 10/24 -1/24 = 29/24
On supprime 5/3 -5/12 -1/24
