268/11 : 2 = (26 * 11 + 8) / 11 : 2 = (286 + 8) / 11 : 2 = 294 / 11 : 2 = 294 / 11 * 1/2 = 294 / (11 * 2) = 294 / 22 = 147 / 11 = 13 4/11
Ответ: 13 4/11