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kino_123


chứng minh rằng với mọi x,y>0 ta có:
[TEX](1+x)(1+\frac{y}{x})(1+\frac{9}{\sqrt{y}})^2 \geq 256[/TEX]
[TEX](1+x)(1+\frac{y}{x})(1+\frac{9}{\sqrt{y}})^2 \geq 256[/TEX]
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