Lg (log2 (log7 x))=0
Lg (log₂ (log₇ x))=0 ОДЗ: х > 0 log₂ (log₇x) = 10⁰ log₂ (log₇x) = 1 log₇x = 2¹ log₇x = 2 x = 7² x = 49 Ответ: 49