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TR-MO-R1 2022 Problem 31

    Bir f:Q+→R+f : \mathbb{Q}^+ \to \mathbb{R}^+ fonksiyonu tüm xx ve yy pozitif rasyonel sayıları için

    f(x)+f(y)−f(x+y)=x2+xy+y2xy(x+y)f(x) + f(y) - f(x+y) = \frac{x^2 + xy + y^2}{xy(x+y)}

    eşitliğini sağlıyor. f(x)f(x) fonksiyonunun aldığı en küçük değer 11 ise, f(1)f(1) nedir?

    a) 11 b) 54\dfrac{5}{4} c) 43\dfrac{4}{3} d) 32\dfrac{3}{2} e) 22

    Official text Turkish Mathematical Olympiad, first round 2022 official paper, page 17. Quoted with source.

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