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TR-MO-R1 2020 Problem 31

    xx ve yy gerçel sayılar olmak üzere x2−2y2=38x^2 - 2y^2 = \dfrac{3}{8} ise, x4−yx^4 - y ifadesinin alabileceği en küçük değer nedir?

    a) −14-\dfrac{1}{4} b) −18-\dfrac{1}{8} c) 00 d) 18\dfrac{1}{8} e) 14\dfrac{1}{4}

    Official text Turkish Mathematical Olympiad, first round 2020 official paper, page 16. Quoted with source.

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