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- Đại học Khoa Học Tự Nhiên - ĐHQG TPHCM
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
$câu 1:m_{a}+m_{b}+m_{c}\geqslant \frac{a^2+b^2+c^2}{2R}.$
$Câu 2: \frac{m_{a}}{sin\frac{A}{2}}+\frac{m_{b}}{sin\frac{B}{2}}+\frac{m_{c}}{sin\frac{C}{2}}\geqslant \frac{a^2+b^2+c^2}{2R}$
$Câu 2: \frac{m_{a}}{sin\frac{A}{2}}+\frac{m_{b}}{sin\frac{B}{2}}+\frac{m_{c}}{sin\frac{C}{2}}\geqslant \frac{a^2+b^2+c^2}{2R}$
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