H
hoangquan_999


Cho a.b.c là những số thực không âm, $a^2+b^2+c^2=1$
CMR: $\dfrac{a}{b^2+c^2}+\dfrac{b}{a^2+c^2}+\dfrac{c}{a^2+b^2}\ge \dfrac{3\sqrt{3}}{2}$
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CMR: $\dfrac{a}{b^2+c^2}+\dfrac{b}{a^2+c^2}+\dfrac{c}{a^2+b^2}\ge \dfrac{3\sqrt{3}}{2}$
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