Решите примеры по действиям: а) 6 3/4-2 5/6-1 3/8= б) 9 8/15-4 1/12+3 7/20= в) 7 5/8+3 2/3-8 3/16= г) 9 23/23-4 7/10-2

а) 6 3/4 - 2 5/6 - 1 3/8 = 27/4 - 17/6 - 11/8 = (162-68-33)/24 = 61/24 = 2 13/24б) 9 8/15 - 4 1/12 + 3 7/20 = 143/15 - 49/12 + 3 7/20 = (1716-735)/180 + 3 7/20 = 981/180 + 3 7/20 = 5 81/180 + 3 7/20 = 5 9/20 + 3 7/20 = 8 16/20 = 8 4/5в) 7 5/8 + 3 2/3 - 8 3/16 = 10 (15+16)/24 - 8 3/16 = 10 31/20 - 131/16 = 271/24 - 131/16 = (542-393)/48 = 149/48 = 3 5/48г) 9 23/23 - 4 7/10 - 2 1/5 = 10 - 4 7/10 - 2 1/5 = 100/10 - 47/10 - 2 1/5 = 53/10 - 11/5 = (53-22)/10 = 31/10 = 3 1/10д) 20 - (3 1/6 +2 3/4) = 20 - (5 + (2+9)/12) = 15 - 11/12 = (180-11)/12 = 169/12 = 14 1/12е) 1 5/6 + (3 - 1 7/10) = 1 5/6 + (30/10 - 17/10) = 1 5/6 + 13/10 = 1 5/6 + 1 3/10 = 2 + (25 + 9)/30 = 3 4/30 = 3 2/15