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lnhoa
04-04-2009, 03:29 PM
http://www.math.temple.edu/~reich/Fib/pascal3.gif

http://12toanhvt.files.wordpress.com/2009/04/cac-bai-toan-day-so-thi-olp_1.pdf
http://12toanhvt.files.wordpress.com/2009/04/cac-bai-toan-day-so-thi-olp_2.pdf