1. c + 15 = 69 + 28,
2. b - 19 = 16 + 14,
Решение:
1. c + 15 = 69 + 28,
c + 15 = 97,
c = 97 - 15,
c = 82.
2. b - 19 = 16 + 14,
b - 19 = 30,
b = 30 + 19,
b = 49.
Ответ: 1) 82, 2) 49.
1) А = {10, 20, 30, 40, 50, 60, 70, 80, 90}
2) B = {1/6, 2/6, 3/6, 4/6, 5/6}
3) C = {7/7, 7/6, 7/5, 7/4, 7/3, 7/2, 7/1}