Сделайте действие: а)4целых4/15+1целая5/9 б)6целых7/15-3целых9/10 в)2целых9/35+1целая9/14 г)4целых1/26-3целых8/39 решите уравнение: а)8-у=4целых1/7 б)4целых3/8+х=6целых1/8

а) 4 4/15 + 1 5/9 = (4 * 15 + 4)/15 + (1 * 9 + 5)/9 = (60 + 4)/15 + (9 + 5)/9 = 64/15 + 14/9 = 192/45 + 70/45 = (192 + 70)/45 = 262/45;

б) 6 7/15 - 3 9/10 = (6 * 15 + 7)/15 - (3 * 10 + 9)/10 = (90 + 7)/15 - (30 + 9)/10 = 97/15 - 39/10 = 2 * 97/30 - 3 * 39/30 = (194 - 117)/30 = 77/30;

в) 2 9/35 + 1 9/14 = (2 * 35 + 9)/35 + (1 * 14 + 9)/14 = (70 + 9)/35 + (14 + 9)/14 = 2 * 79/70 + 5 * 23/70 = (158 + 115)/70 = 273/70;

г) 4 1/26 - 3 8/39 = 3 * (4 * 26 + 1)/78 - 2 * (3 * 39 + 8)/78 = 315/78 - 250/78 = (315 - 250)/78 = 65/78;

а) 8 - у = (4 * 7 + 1)/7;

у = 8 - 29/7 = 56/7 - 29/7 = 27/7;

б) (4 * 8 + 3)/8 + х = (6 * 8 + 1)/8;

х = 49/8 - 35/8 = 14/8 = 7/4.