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baotran2906
2 năm trước
cho x,y,z>0 cmr (1+$\frac{x}{y}$ ).(1+$\frac{y}{z}$ ).(1+$\frac{z}{x}$ ) ≥2.(1+$\frac{x+y+z}{\sqrt[3]{x.y.z} }$ )
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