Помогите пожалуйста!!! дам 15 баллов
A) 5/15= 6/18 = 7/21= 8/24 б) 1/4 = 2/8 = 3/12 = 4/16 = 5/20 = 6/24 = 7/28 в) 2/5 = 4/10 = 6/15 = 8/20 = 10/25 = 12/30 = 14/35