1)3/5 : 9/25 2)11/18: 22/45 3)20/21: 30/35 4)27/50: 36/75 с решениемм как решали

1)3/5 : 9/25 = 3*25/5*9 = 5/3 = 1 2/3
2)11/18:22/45 = 11*45/18*22 = 5/6
3)20/21:30/35 = 20*35/21*30 = 10/9 = 1 1/9
4)27/50:36/75 = 27*75/50*36 = 9/8 = 1 1/8