Log 1/7 49 = -2 log 4 8 = 1/2 * 3 log 2 2 = 3/2 log 4 128 = 1/2 * 7 log 2 2 = 7/2 -2+3/2+7/2=3 3 в степени log 3 17 = 17 Ответ : 17