Bonjour,
a)
9/7 + 8/7 = 17/7
b)
une sostraction, on met au même dénominateur
3/5 = 9/15
23/15 - 9/15 = 14/15
=> 14/15 + 3/5 = 23/15
c)
23/24 - 24/24 = 1/24
3/4 + 1/24 = 23/14
d)
9/7 = 8/7 = 1/7
e)
5/8 = 25/40
25/40 - 3/40 = 22/40 = 11/20
5/8 - 11/20 = 3/40
f)
5/2 = 10/4
14/4 - 10/4 = 4/4 = 1
