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trieutuyennham

trieutuyennham

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Cho $\bigtriangleup ABC$ nhọn nội tiếp (O;R);a;b;c là 3 cạnh của tam giác 

CMR: $R\geq \frac{\sum \sqrt{4R^{2}-a^{2}}}{3}$


Edited by trieutuyennham, 01-08-2017 - 21:04.





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