Вычислите: а)7/16 1/4; б) 25/36-2/9; в)7/12-5/24; г)5/7-11/21; д)1/6 5/18; е)19/45 4/15; ж)15/16-3/2; з)7/15 1/3; и)11/13-20/39; к)3/50 18/25; л)43/62-10/31; м)29/64 3/8; дроби.. пож очень нужно.. зарание большое спасибо

а) 7/16 + 1/4 = (7+4)/16 = 11/17 б) 25/36 - 2/9 = (25-8)36 = 17/36 в) 7/12 - 5/24 = (14-5)/24 = 9/24 = 3/8 г) 5/7 - 11/21 = (15-11)/21 = 4/21 д) 1/6 + 5/18 = (3+5)/18 = 8/18 = 4/9 е) 19/45 + 4/15 = (19+12)/45 = 31/45 ж) 15/16 - 3/2 = (15-24)/2 = -9/2 = -4 1/2 з) 7/15 + 1/3 = (7+5)/15 = 12/15 = 4/5 и) 11/13 - 20/39 = (33-20)39 = 13/39 = 1/3 к) 3/50 + 18/25 = (3+36)/50 = 39/50 л) 43/62 - 10/31 = (43-20)/62 = 23/62 м) 29/64 + 3/8 = (29+24)/64 = 53/64