Bonjour,
a)
12/20 = 6/10 = 3/5
b)
15/30 = 1/2
c)
768/140 = 384/70= 192/35
d)
96/84 = 48/42= 24/21 = 8/7
e)
280/ 35 =56/7
Exercice 6
a =2/7
b= 15
c= 7/8
d= 9/2