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Chứng minh

chung minh

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TMW

TMW

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Cho a,b,c là các số dương. Chứng minh rằng:

$\frac{a}{b}+\frac{b}{c}+\frac{c}{a}\geq \sqrt{\frac{a^{2}+1}{b^{2}+1}}+\sqrt{\frac{b^{2}+1}{c^{2}+1}}+\sqrt{\frac{c^{2}+1}{a^{2}+1}}$







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