Выразите дроби в одинаковых долях: 1) 3/25 и 17/300; 2) 5/12 , 1/20 и 17/60; 3) 11/30 , 19/180 и 1/15 заранее !

1)
3/25 = 12/12 * 3/25 = 36/300 и 17/300;
2)
5/12 = 5/5 * 5/12 = 25/60 , 1/20 = 3/3 * 1/20 = 3/60  и 17/60;
3)
11/30 = 6/6 * 11/30 = 66/180 , 19/180 и 1/15 = 12/12 * 1/15 = 12/180