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$\sum \frac{1}{(\sqrt1 + \sqrt3)^3}< \frac{11}{90}$


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XanCao

XanCao

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CMR: $\frac{1}{(\sqrt1 + \sqrt3)^3}+\frac{1}{(\sqrt3 +\sqrt5)^3}+...+\frac{1}{(\sqrt{2003}+\sqrt{2005})^3} < \frac{11}{90}$

 

Mong mọi người thứ lỗi vì mình không gõ được theo đúng dạng


Edited by votruc, 03-09-2015 - 21:10.

With many people, mathematics is just a subject...

With me, it's my passion...

:icon12:Mathematics  :icon12: 

 





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