2log0.2(9)xlog9(5) помогите пожалуйста
2log0.2(9) * log9(5) = log0.2(81) * log 9 (5) = log9 (81) / log9 (0.2) * log9 (5)= 2 / log9 (1/5) * log9 (5) = 2 / [log9 1 - log9(5)] * log9(5) = 2 / [0-log9(5)] * log9(5) = 2/ (-log9(5)) * log9(5) = -2