bạn vt thiếu sô 6 kìa

\(\left\{{}\begin{matrix}x\left(x+21\right)+y\left(x-33\right)=2\left(y^2+50\right)\\\sqrt{x+2}+2\sqrt{y+11}=\sqrt{\left(4y-x+14\right)^3}\end{matrix}\right.\)

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

\(\left\{{}\begin{matrix}x^2+xy+y^2=3\\7\left(x^5+y^5\right)=31\left(x^3+y^3\right)\end{matrix}\right.\)