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deat_stock
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
cho x,y,z dương thỏa mãn:x+y+z=[TEX]\frac{18}{\sqrt{2}}[/TEX]
[TEX]\frac{1}{\sqrt{x(y+z}}[/TEX]+[TEX]\frac{1}{\sqrt{y(y+z)}}[/TEX]+[TEX]\frac{1}{z(x+y)}[/TEX] [TEX]\geq[/TEX] [TEX]\frac{1}{4}[/TEX]
[TEX]\frac{1}{\sqrt{x(y+z}}[/TEX]+[TEX]\frac{1}{\sqrt{y(y+z)}}[/TEX]+[TEX]\frac{1}{z(x+y)}[/TEX] [TEX]\geq[/TEX] [TEX]\frac{1}{4}[/TEX]