2. Решите уравнение: 1) x · 28 = 336; 2) 312 : x = 8; 3) 16x − 11x = 225

1. \(x \cdot 28 = 336\)
   \(x = 336 : 28 = 12\).
2. \(312 : x = 8\)
   \(8x = 312\)
   \(x = 312 : 8 = 39\).
3. \(16x - 11x = 225\)
   \(5x = 225\)
   \(x = 225 : 5 = 45\).

Ответ: 1) \(x=12\); 2) \(x=39\); 3) \(x=45\).