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TR-MO-R1 2010 Problem 15

    x,y,zx, y, z gerçel sayıları, xyzx+y=−1\dfrac{xyz}{x+y} = -1, xyzy+z=1\dfrac{xyz}{y+z} = 1 ve xyzz+x=2\dfrac{xyz}{z+x} = 2 eşitliklerini sağlıyorsa, xyzxyz aşağıdaki değerlerden hangisini alabilir?

    a) −815-\dfrac{8}{\sqrt{15}} b) 85\dfrac{8}{\sqrt{5}} c) −835-8\sqrt{\dfrac{3}{5}} d) 715\dfrac{7}{\sqrt{15}} e) Hiçbiri

    Official text Turkish Mathematical Olympiad, first round 2010 official paper, page 5. Quoted with source.

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