log0.2 по основанию 125 : log16 по основанию 64 * log3 по основанию 81
log125(0.2) / log64(16) * log81(3) = log5^3(5^-1) / log4^3(4^2) * 1/4 = -1/3 / 2/3 * 1/4 = -1/2 * 1/4 = -1/8 = -0.125
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log125(0.2) / log64(16) * log81(3) = log5^3(5^-1) / log4^3(4^2) * 1/4 = -1/3 / 2/3 * 1/4 = -1/2 * 1/4 = -1/8 = -0.125