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TR-MO-R1 2010 Problem 31

    Aşağıdaki (A,B)(A, B) ikililerinden hangisi için

    x2+xy+y=Ayy−x=B\begin{aligned} x^2 + xy + y &= A \\ \frac{y}{y - x} &= B \end{aligned}

    denklem sisteminin gerçel çözümü yoktur?

    a) (1/2,2)(1/2, 2) b) (−1,1)(-1, 1) c) (2,2)(\sqrt{2}, \sqrt{2}) d) (1,1/2)(1, 1/2) e) (2,2/3)(2, 2/3)

    Official text Turkish Mathematical Olympiad, first round 2010 official paper, page 9. Quoted with source.

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