K
kutephantom


Giai hệ phuong trinh sau: $\left\{ \begin{array}{l} x^2+y^2 +x + y=8 \\ x^2 - 3y^2 +2xy + 5y -x =2 \end{array} \right.$
giai gium minh voi, cam on!
giai gium minh voi, cam on!
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