C
cao_thu_online


Giải hệ phương trình:
\left\{ \begin{matrix} (x^2+y^2)(1+\frac{1}{xy})^2=9\\(x^3+y^3)(1+\frac{1}{xy})^3 =4\end{matrix}\right.
\left\{ \begin{matrix} (x^2+y^2)(1+\frac{1}{xy})^2=9\\(x^3+y^3)(1+\frac{1}{xy})^3 =4\end{matrix}\right.
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