A
anh_duong_td


Cho [TEX]a^2 + b^2 + c^2 = 1[/TEX] a ; b; c dương
C/M [TEX]\frac{a}{b^2 + c^2} + \frac{b}{a^2 + c^2} + \frac{c}{a^2 + b^2} \geq \frac{3\sqrt{3}}{2}[/TEX]
C/M [TEX]\frac{a}{b^2 + c^2} + \frac{b}{a^2 + c^2} + \frac{c}{a^2 + b^2} \geq \frac{3\sqrt{3}}{2}[/TEX]
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