Cho ab+bc+ca=3.CMR:$\frac{1}{a^{2}+1}+\frac{1}{b^{2}+1}+\frac{1}{c^{2}+1}\geq \frac{3}{2}$
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Started By blink04, 11-05-2019 - 19:48
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Posted 11-05-2019 - 19:48
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