J
jackwonder


[tex]\left\{ \begin{array}{l} x^2+y^2+xy+1 = 4y \\ y(x+y)^2 = 2x^2+7y+2 \end{array} \right.[/tex]
[tex]\left\{ \begin{array}{l} ln(1+x)-ln(1+y)=x-y \\ x^2-12xy+20y^2=0 \end{array} \right.[/tex]
Cảm ơn hocmai nhiều
[tex]\left\{ \begin{array}{l} ln(1+x)-ln(1+y)=x-y \\ x^2-12xy+20y^2=0 \end{array} \right.[/tex]
Cảm ơn hocmai nhiều