Вычислим lg 9 (log₂ 15 + log₂ 4 - log₂ 6)
lg 9 (log₂ 15 + log₂ 4 - log₂ 6) = lg 9 (log₂ (15 × 4 / 6)) = lg 9 (log₂ 10)
Ответ: lg 9 (log₂ 10)