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Posted by magicdell1 on 13-01-2016 - 20:48
Câu 27 : $\left\{\begin{matrix}4x+4y+xy=14 \\ x^{2}+y^{2}+xy=7 \end{matrix}\right.$
Posted by magicdell1 on 13-01-2016 - 13:29
Bài 16 $$\left\{\begin{matrix}2x^{2}-y^{2}=1 \\ xy + x^{2}=2 \end{matrix}\right.$$
=2