I) 1) 10 3/7 - 2 1/3 = 73/7 - 7/3 = 219/21 - 49/21 = (219 - 49)/21 = 170/21 = 8 2/21 - второе число.
2) 10 3/7 + 8 2/21 = 219/21 + 170/21 = (219 + 170)/21 = 389/21 = 18 11/21
II) 1) 7 3/16 : 5 = 115/16 • 1/5 = (115 • 1)/(16 • 5) = 23/16 = 1 7/16 - второе число.
2) 7 3/16 + 1 7/16 = 8 10/16 = 8 5/8 = 8,625
Ответ: 1) 18 11/21; 2) 8 5/8.