D
demon_tg


giải ohương trình:
[tex]\left\{\begin{array}{l}xy+x+3y= x^{2} \\x \sqrt{2y} +y \sqrt{x-1} =2x-2y\end{array}\right.[/tex]
[tex]\left\{\begin{array}{l}xy+x+3y= x^{2} \\x \sqrt{2y} +y \sqrt{x-1} =2x-2y\end{array}\right.[/tex]
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