Edited by dark templar, 16-03-2013 - 18:10.
#1
Posted 25-07-2005 - 14:50
QUANVU
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B&S-D
$a_1,a_2,...,a_n$ và $k\in\{0,1,...,n-2\}$.Chứng minh rằng $\sum\limits_{i=1}^{n}a_i^k(-1)^{i-1}C_{n-1}^{i-1}=0.$
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