50 * (14 - 12) : 2 = 400
50 * 2 : 2 = 400
100 : 2 = 400
50 = 400 - неверно.
(50 * 14 - 12) : 2 = 400 (700 - 12) : 2 = 400 688 : 2 = 400 344 = 400 - неверно.
50 * (14 - 12 : 2) = 400 50 * (14 - 6) = 400 50 * 8 = 400 400 = 400 - верно
Ответ: 50 * (14 - 12 : 2)