1)3/4 и 19/40=30/40 и 19/40,
2)6/7 и 4/5=30/35 и 28/35,
3)5/6 и 7/8=20/24 и 21/24
4)5/24 и 15/16=10/48 и 45/48
5)9/10 и 1/4=18/20 и 5/20
