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![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
[TEX]\left\{ \begin{array}{l} x= 2- y^2\\ y= 2- z^2\\ z= 2- x^2 \end{array} \right. [/TEX]
[TEX]\left\{ \begin{array}{l} x^2= y+1\\ y^2= z+1\\ z^2= x+1\end{array} \right. [/TEX]
[TEX]\left\{ \begin{array}{l} x^2+ y^2- 2Z^2= 2a^2\\ x+ y+ 2z= 4(a^2+1)\\ Z^2- xy= a^2\end{array} \right. [/TEX] (a là tham số)
[TEX]\left\{ \begin{array}{l} x^2= y+1\\ y^2= z+1\\ z^2= x+1\end{array} \right. [/TEX]
[TEX]\left\{ \begin{array}{l} x^2+ y^2- 2Z^2= 2a^2\\ x+ y+ 2z= 4(a^2+1)\\ Z^2- xy= a^2\end{array} \right. [/TEX] (a là tham số)