75th Kürschák Competition 1975

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1.  Transform the equation ab2(1/(a + c)2 + 1/(a - c)2) = (a - b) into a simpler form, given that a > c ≥ 0, b > 0.
2.  Prove or disprove: given any quadrilateral inscribed in a convex polygon, we can find a rhombus inscribed in the polygon with side not less than the shortest side of the quadrilateral.
3.  Let x0 = 5, xn+1 = xn + 1/xn. Prove that 45 < x1000 < 45.1.

The original problems are in Hungarian. Many thanks to Péter Dombi for the translation.

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(C) John Scholes
jscholes@kalva.demon.co.uk
19 Apr 2003
Last corrected/updated 19 Apr 2003