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TR-MO-R1 2015 Problem 7

    xy(x−y)=1xy(x-y) = 1 ve x2−xy+y2=y+1x^2 - xy + y^2 = y + 1 koşullarını sağlayan (x,y)(x, y) gerçel sayı ikilileri için x2+y2x^2 + y^2 ifadesinin alabileceği en büyük ve en küçük değerlerin farkı kaçtır?

    a) 11 b) 2\sqrt{2} c) 3\sqrt{3} d) 22 e) 5\sqrt{5}

    Official text Turkish Mathematical Olympiad, first round 2015 official paper, page 3. Quoted with source.

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