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tienqm123
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
cho $(a+b+c)^2 = a^2+b^2+c^2$
CMR : $\dfrac{1}{a^3} + \dfrac{1}{b^3} + \dfrac{1}{c^3} = \dfrac{3}{abc}$
CMR : $\dfrac{1}{a^3} + \dfrac{1}{b^3} + \dfrac{1}{c^3} = \dfrac{3}{abc}$
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