1) 8/15 : 6 = 8/15 * 1/6
12:4/5 = 12 * 5/4
5/10:9/11 = 5/10 * 11/9
7/12:2 1/18 = 7/12:37/18 = 7/12 * 18/37
2)
2 :2/3 = 2*3/2 = 3
5:5/7 = 5*7/5 = 7
4:8/9 = 4 * 9/8 = 9/2 = 4,5
130 : 1/10 = 130 * 10 = 1300
2/7 : 5/14 = 2/7 * 14/5 = 4/5
7/12 :5/6 = 7/12 * 6/5 = 7/10
1/300 : 300 = 1/300 * 1/300 == 1/90000