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TR-MO 2024 Problem 5

    Her x,y,z∈R+x, y, z \in \mathbb{R}^+ için

    {f(x)f(y)}+{f(y)f(z)}+{f(z)f(x)}={xy}+{yz}+{zx}\left\{ \frac{f(x)}{f(y)} \right\} + \left\{ \frac{f(y)}{f(z)} \right\} + \left\{ \frac{f(z)}{f(x)} \right\} = \left\{ \frac{x}{y} \right\} + \left\{ \frac{y}{z} \right\} + \left\{ \frac{z}{x} \right\}

    denklemini sağlayan tüm f:R+→R+f : \mathbb{R}^+ \to \mathbb{R}^+ fonksiyonlarını bulunuz.

    Not. Bir xx gerçel sayısı için, ⌊x⌋\lfloor x \rfloor sayısı xx in tam değeri olmak üzere, {x}=x−⌊x⌋\{x\} = x - \lfloor x \rfloor olarak tanımlanıyor: {2.7}=0.7\{2.7\} = 0.7 ve {4}=0\{4\} = 0.

    Official text Turkish Mathematical Olympiad 2024 official paper, page 2. Quoted with source.

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