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TR-MO-R1 2016 Problem 11

    (x+2y)(y+2z)(z+2x)=1(2x+y)(2y+z)(2z+x)=2(x+y)(y+z)(z+x)=3\begin{aligned} (x+2y)(y+2z)(z+2x) &= 1 \\ (2x+y)(2y+z)(2z+x) &= 2 \\ (x+y)(y+z)(z+x) &= 3 \end{aligned}

    denklem sistemini sağlayan x,y,zx, y, z gerçel sayıları için xyzxyz ifadesi aşağıdakilerden hangisine eşit olabilir?

    a) −12-\dfrac{1}{2} b) −52-\dfrac{5}{2} c) 14\dfrac{1}{4} d) 54\dfrac{5}{4} e) Hiçbiri

    Official text Turkish Mathematical Olympiad, first round 2016 official paper, page 5. Quoted with source.

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