R
rinnegan_97


cho 2 số dương a, b thỏa mãn [TEX]a^2+2b^2\leq3c^2[/TEX]
CMR; [TEX]\frac{1}{a}+\frac{2}{b}\geq\frac{3}{c}[/TEX]
CMR; [TEX]\frac{1}{a}+\frac{2}{b}\geq\frac{3}{c}[/TEX]
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