分からない問題はここに書いてね432 [無断転載禁止]©2ch.net

f(x) = (log(x)^m)/x
f'(x) = (m - log(x))*(log(x)^(m-1))/x^2

f(x) ≤ f(exp(m)) = m^(m-1) = C_m