Răspuns :
4/12 simplificam prin 2= 2/6 si mai simplificam prin 2 si obt 1/3
6/15 simplificam prin 3=2/5
24/48 simplificam prin 2=12/24 si mai simplificam prin2=6/12 si simpl prin 3=3/6 si simplificam prin 3=1/2
9/12 simpl prin 3 =3/4
8/20 simp prin 4=4/5
12/40 simpl prin 2=6/20 si simpl prin 2=10/3
6/15 simplificam prin 3=2/5
24/48 simplificam prin 2=12/24 si mai simplificam prin2=6/12 si simpl prin 3=3/6 si simplificam prin 3=1/2
9/12 simpl prin 3 =3/4
8/20 simp prin 4=4/5
12/40 simpl prin 2=6/20 si simpl prin 2=10/3