N
nom1
![](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 =0 và abc khác 0
Tính A= \frac{ab}{a^2+b^2-c^2} + \frac{bc}{b^2+c^2-a^2} + \frac{ac}{a^2+c^2-b^2}
Tks
Tính A= \frac{ab}{a^2+b^2-c^2} + \frac{bc}{b^2+c^2-a^2} + \frac{ac}{a^2+c^2-b^2}
Tks