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$f(x).f(\frac{1}{x})=1$

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Iris2829829212

Iris2829829212

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Tìm $f: \mathbb{R} \rightarrow \mathbb{R}$ thoả mãn:

i) $f(1)=1;$

ii) $f(x).f (\frac{1}{x})=1, \forall x \neq 1.$


Edited by halloffame, 14-10-2017 - 23:20.






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