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lamhaisonbd
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
Cho a,b,c là 3 cạch tam giác
CMR: [TEX]1 < \frac {a}{b+c} + \frac {b}{a+c} + \frac {c}{a+b} < 2[/TEX]
CMR: [TEX]1 < \frac {a}{b+c} + \frac {b}{a+c} + \frac {c}{a+b} < 2[/TEX]
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