De-a valma…

Suma patratelor – demonstratie fara cuvinte 8 July 2013

Filed under: Amestecate,FREE DOWNLOAD,Resurse — Sorin Borodi @ 20:10
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  Deducerea formulei \mathbf{1^{2}+2^{2}+3^{2}+...+n^{2}=\frac{n(n+1)(2n+1)}{6}}
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Diferenta a doua patrate – gif animat 20 January 2013

Filed under: Amestecate,FREE DOWNLOAD,Resurse — Sorin Borodi @ 14:22
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