De-a valma…

Suma lui Gauss 15 August 2016

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Suma numerelor impare consecutive 1+3+5+… este pătrat perfect 6 August 2016

Filed under: Amestecate,FREE DOWNLOAD,Resurse — sorinborodi @ 4:33
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Cum calculam o suma de puteri? 16 November 2013

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Pentru suma patratelor 1²+2²+3²+…+n² click aici

Pentru suma cuburilor 1³+2³+3³+…+n³ click aici.

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Suma patratelor – demonstratie fara cuvinte 8 July 2013

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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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Patratul unei sume – gif animat 20 January 2013

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Suma cuburilor -gif animat 2 17 January 2013

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Suma cuburilor – gif animat 13 January 2013

Filed under: Amestecate,FREE DOWNLOAD,Resurse — sorinborodi @ 18:36
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