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Member Since 30-04-2016
Offline Last Active 12-09-2016 - 19:13

04-08-2016 - 11:01

Cho a,b,c là các sô thực không âm. Chứng minh rằng

$\sum \frac{2a^2-bc}{b^2-bc+c^2}\geq 3$

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