Các bài toán về dãy số thi OLP 30/4

http://www.math.temple.edu/~reich/Fib/pascal3.gif

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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

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