M
mamy007


1)Hpt`
[tex]\left\{ \begin{array}{l} x^2+y^2-xy=3 \\ \sqrt{x^2+1}+\sqrt{y^2+1} =4 \end{array} \right.[/tex]
2) Pt`
[TEX]x^2+(x+1)\sqrt{\frac{x-1}{x+1}}-3\leq0[/TEX]
[tex]\left\{ \begin{array}{l} x^2+y^2-xy=3 \\ \sqrt{x^2+1}+\sqrt{y^2+1} =4 \end{array} \right.[/tex]
2) Pt`
[TEX]x^2+(x+1)\sqrt{\frac{x-1}{x+1}}-3\leq0[/TEX]