olgatea (
olgatea
) wrote
2008
-
01
-
04
11:21 pm
puzzles, riddles и brain-teasers
http://www.hoagiesgifted.org/mathematics.htm
http://www.klsh.ru/problems/index_html?query_start=1
http://www.websmekalka.h10.ru/logika.htm
http://golovolomka.hobby.ru/
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