1ц1/5-1/4
1ц1/6-1/5
1ц1/9-1/6
1ц1/8-5/6

1 1/5 - 1/4 = 6/5 - 1/4 = 24/20 - 5/20 = 19/201 1/6 - 1/5 = 7/6 - 1/5 = 37/30 - 6/30 = 29/301 1/9 - 1/6 = 10/9 - 1/6 = 20/18 - 3/18 = 17/181 1/8 - 5/6 = 9/8 - 5/6 = 27/24 - 20/24 = 7/24