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soilearn


1)
[tex]\left\{ \begin{array}{l} x^2 + y^2 +xy=7 \\ x^2 + y^2 - xy=3 \end{array} \right.[/tex]
2)
[tex]\left\{ \begin{array}{l} x+y = 4 \\ xy=m \end{array} \right.[/tex]
2)
[tex]\left\{ \begin{array}{l} x^2 + y^2 +xy=7 \\ x^2 + y^2 - xy=3 \end{array} \right.[/tex]
2)
[tex]\left\{ \begin{array}{l} x+y = 4 \\ xy=m \end{array} \right.[/tex]
2)
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