No replies to this topic

[thutrang131]

$\left\{\begin{matrix} x^{3}+3x^{2}+2x-5=0 & & \\ y^{3}+3y^{2}+2y-5=0 & & \\ z^{3}+3z^{2}+2z-5=0 & & \end{matrix}\right.$