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IMO 2009 problema 5
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IMO 2009 problema 5
Posted:
Tue Aug 04, 2009 10:38 am
by
Omer Cerrahoglu
Determinati toate functiile
\( f:\mathbb{N}^* \rightarrow \mathbb{N}^* \)
cu proprietatea ca
\( f(a) \)
,
\( b \)
si
\( f(b+f(a)-1) \)
pot fi laturile unui triunghi nedegenerat.