2log₂27 - log₂81 - 2log₂18 = log₂27² - log₂81 - log₂18² = log₂(27² / (81 * 18²)) = log₂(729 / (81 * 324)) = log₂(729 / 26244) = log₂(1 / 36) = log₂(1) - log₂(36) = 0 - log₂(36) = - log₂(36)
Ответ: нет верного ответа.