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$(f(x) + y)(f(y) + x)$ kuadrat sempurna

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Cari semua $f: \mathbb{N} \to \mathbb{N}$ sehingga $(f(x) + y)(f(y) + x)$ kuadrat sempurna untuk semua $x, y \in \mathbb{N}$.



IMO 2010 no. 3

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