Tìm tất cả các hàm số $f: \mathbb{R} \setminus \{ 6 \} \rightarrow \mathbb{R} \setminus \{ 6 \}$ thỏa mãn $f(\frac{-9}{x-6})=\frac{-9}{f(x)-6}, \forall x \neq 6.$
Edited by halloffame, 12-02-2017 - 21:33.
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