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tugiagiangho


với x>0 y>0 z>0, cmr
[tex] xy+yz+zx \geq\frac{1}{\sqrt{x}} + \frac{1}{\sqrt{y}} + \frac{1}{\sqrt{z}}[/TEX]
[tex] xy+yz+zx \geq\frac{1}{\sqrt{x}} + \frac{1}{\sqrt{y}} + \frac{1}{\sqrt{z}}[/TEX]
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