Вычислим log₅ 2 - log₅ 2 - log₅ 6 + log₅ 18
log₅ 2 - log₅ 2 - log₅ 6 + log₅ 18 = log₅ (2/2) + log₅ (18/6) = log₅ 1 + log₅ 3 = 0 + log₅ 3 = log₅ 3
Ответ: log₅ 3