Tuesday, November 9, 2010
19th All Soviet Union Mathematical Olympiad Problems 1985
1. ABC is an acute angled triangle. The midpoints of BC, CA and AB are D, E, F respectively. Perpendiculars are drawn from D to AB and CA, from E to BC and AB, and from F to CA and BC. The perpendiculars form a hexagon. Show that its area is half the area of the triangle. 2. Is there an integer n such that the sum of the (decimal) digits of n is 1000 and the sum of
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