Решите пожалуйста 1 2/3 - в = 5/6
1 2/3 - b = 5/6 b = 1 2/3 - 5/6 b = 1 4/6 - 5/6 b = 10/6 - 5/6 b = 5/6 ------------------------------ Проверка: 1 2/3 - 5/6 = 5/6 1 4/6 - 5/6 = 5/6 10/6 - 5/6 = 5/6 5/6 = 5/6