а). 5/12 и 11/18=15/36 и 22/36
б). 10/28 и 60/63=5/14 и 20/21=15/42 и 40/42=15/42
в). 38/57 и 14/18 и 15/18=228/342 и 266/342 и 285/342
а). 5/12 и 11/18=15/36 и 22/36
б). 10/28 и 60/63=5/14 и 20/21=15/42 и 40/42=15/42
в). 38/57 и 14/18 и 15/18=228/342 и 266/342 и 285/342