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1, [tex]\left\{ \begin{array}{l} (x + y)(1 + xy) = 18xy \\ (x^2 + y^2)(1 + x^2y^2) = 208x^2y^2 \end{array} \right.[/tex]
2, [tex]\left\{ \begin{array}{l} y(x^2 + 1) = 2x( y^2 + 1) \\ (x^2 + y^2)( 1 + \fra{1}{x^2y^2} = 24 \end{array} \right.[/tex]
2, [tex]\left\{ \begin{array}{l} y(x^2 + 1) = 2x( y^2 + 1) \\ (x^2 + y^2)( 1 + \fra{1}{x^2y^2} = 24 \end{array} \right.[/tex]
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