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TR-MO-R1 2008 Problem 19

    f:(0,∞)→(0,∞)f:(0,\infty)\to(0,\infty) fonksiyonu her x,y∈(0,∞)x,y\in(0,\infty) için

    10⋅x+yxy=f(x)⋅f(y)−f(xy)−9010\cdot\frac{x+y}{xy}=f(x)\cdot f(y)-f(xy)-90

    denklemini sağlıyorsa f(111)f(\frac{1}{11}) kaçtır?

    a) 11 b) 1111 c) 2121 d) 3131 e) Tek türlü bulunamaz

    Official text Turkish Mathematical Olympiad, first round 2008 official paper, page 6. Quoted with source.

    A model read this text from the scan of the paper by OCR, with vision/claude@2.1.318 (claude-opus-5-5). No person has checked it against the paper yet.

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