а) 5/9 - 1/3 = 5/9 - 3/9 = 2/9
б) 7/10 - 3/5 = 7/10 - 6/10 = 1/10
в) 16/27 - 1/9 = 16/27 - 3/27 = 13/27
г) 3/5 - 13/45 = 27/45 - 13/45 = 14/45
д) 1/3 - 8/27 = 9/27 - 8/27 = 1/27
е) 1/2 - 1/3 = 3/6 - 2/6 = 1/6
ж) 3/5 - 1/3 = 9/15 - 5/15 = 4/15
з) 7/8 - 2/3 = 21/24 - 16/24 = 5/24
и) 3/4 - 4/7 = 21/28 - 16/28 = 5/28
к) 9/16 - 11/24 = 27/48 - 22/48 = 5/48
л) 11/12 - 11/18 = 99/108 - 66/108 = 33/108 = 11/36