выполнить деление смешанных чисел а) 1 3/15 :5 7/9 б) 7

а) 1 3/15 : 5 7/9 = (1 * 15 + 3)/15 : (5 * 9 + 7)/9 = 18/15 : (45 + 7)/9 = 18/15 : 52/9 = 18/15 * 9/52 = (18 * 9)/(15 * 52) = 27/130;

б) 7 3/11 : 4 4/9 = (7 * 11 + 3)/11 : (4 * 9 + 4)/9 = (77 + 3)/11 : (36 + 4)/9 = 80/11 : 40/9 = 80/11 * 9/40 = (80 * 9)/(11 * 40) = 18/11;

в) 33 1/3 : 3 1/3 = (33 * 3 + 1)/3 : (3 * 3 + 1)/3 = (99 + 1)/3 : (9 + 1)/3 = 100/3 : 10/3 = 100/3 * 3/10 = (100 * 3)/(3 * 10) = 10;

г) 8 4/7 : 3 2/5 = (8 * 7 + 4)/7 : (3 * 5 + 2)/5 = (56 + 4)/7 : (15 + 2)/5 = 60/7 : 17/5 = 60/7 * 5/17 = (60 * 5)/(7 * 17) = 300/119.