Math is a big interest for me. I This blog will contain proof of interesting mathematics problems which covers Geometry, Algebra, Number theory and Combinatorics with various solution and generalizations.And I will try to make each post enjoyable to read and useful to the reader.
(By my bad English writing, some problem may be post in Chinese.)
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Tuesday, March 6, 2012
Let ABCD be a quadrilateral E,F,G,H be the middle points of AB BC CD DA
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