11/20 -5/12; 3/16+1/24; 7/25 -4/15; 3/8 +7/20; 19/45-7/18;
Ответ 6/8 4/25 3/35 4/62
А) 11/20 -5/12 = 33/60 -25/60 = 6/60 = 1/10 б)3/16+1/24 = 9/48+2/48 = 11/48 в)7/25 -4/15 = 21/75 -20/75 = 1/75 г)3/8 +7/20 = 15/40 +14/40 = 29/40 д)19/45 -7/18 = 38/90 -35/90 = 3/90 = 1/30