сократить а) 18/20 5/10 16/12 30/20 12/9 2/6 б) 55/22 17/51 12/8 24/40 15/6 10/100

18/20 = 9/10
5/10 = 1/2
16/12 = 4/3
30/20 = 3/2
12/9 = 4/3
2/6 = 1/3

55/22 = 5/2
17/51 = 1/3
12/8 = 3/2
24/40 = 3/5
15/6 = 5/2
10/100 = 1/10