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[thuylinhnguyenthptthanhha]

CMR với mọi $x \in R,$ ta có:

$$x^n=\frac{1}{2^n} \sum_{k=0}^{n} C_{n}^{k} (2x-1)^k$$ ( $n \in N)$

 

Edited by thuylinhnguyenthptthanhha, 21-10-2016 - 20:10.