Выполните действия: а)3/8-1/7 , б)11/80-11/90,в)5/3-4/9 г)6-2 целых 13/18 ,д)23/25-11/15,е)8целых 1/8 - 3целых 1/9

а) 3/8 - 1/7 =  21/56 - 8/56 = 13/56;

б) 11/80 - 11/90 = 9907200 - 880/7200 = 110/7200 = 55/3600 = 11/720;

в) 5/3 - 4/9 = 45/27 - 12/27 = 33/27 = 11/9 = 1 2/9;

г) 6 - 2 13/18 = 108/18 - 49/18 = 59/18 = 3 5/18;

д) 23/25 - 11/15 = 69/75 - 55/75 = 14/75;

е) 8 1/8 - 3 1/9 = 65/8 - 28/9 = 585/72 - 224/72 = 361/72 = 5 1/72.