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Posted by xuan love hang an on 22-02-2015 - 11:03
Giải hệ phương trình sau:
$\left\{\begin{matrix} x^{2}+xy-y^{2}+3y+4=0 & & \\ x^{2}+2xy-y^{2}+11x+6y-2=0 & & \end{matrix}\right.$