Giải hệ phương trình:$$\left\{ \begin{array}{l}\dfrac{1}{1+\sqrt{x+1}}+\dfrac{1}{1+\sqrt{y+1}}= \dfrac{2}{3}\\ \sqrt{x+\dfrac{y}{x}}+\sqrt{y+\dfrac{x}{y}}=\dfrac {2\sqrt{x}\sqrt{y}}{3} +2\end{array} \right.$$
Edited by Alexman113, 07-05-2014 - 18:13.
