C
cassakun
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
Cho các số thực dương a,b,c thoả mãn a+b+c=1. Chứng minh rằng:
[TEX]\sqrt[]{\frac{ab}{c+ab}} + \sqrt[]{\frac{bc}{a+bc}} + \sqrt[]{\frac{ca}{b+ca}}\leq\frac{3}{2}[/TEX]
[TEX]\sqrt[]{\frac{ab}{c+ab}} + \sqrt[]{\frac{bc}{a+bc}} + \sqrt[]{\frac{ca}{b+ca}}\leq\frac{3}{2}[/TEX]