\(\left\{{}\begin{matrix}x^2+y^2=\dfrac{1}{2}\\x^3+3xy^2=\dfrac{1}{2}\end{matrix}\right.\)

\(\left\{{}\begin{matrix}\left(1+x^2\right)^2\left(1+\dfrac{1}{y^4}\right)=8\\\left(1+y^2\right)^2\left(1+\dfrac{1}{x^4}\right)=8\end{matrix}\right.\)

Em cảm ơn ạ !!!

\(\left\{{}\begin{matrix}x+1=\sqrt{2+\sqrt{y+3}}\\y+1=\sqrt{2+\sqrt{x+3}}\end{matrix}\right.\)

  Em cảm ơn ạ !!!!