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xuan love hang an

xuan love hang an

Member Since 22-02-2015
Offline Last Active 15-08-2015 - 14:05
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#545278 Giải hệ $\left\{\begin{matrix} x^{2...

Posted by xuan love hang an on 22-02-2015 - 11:03

Giải hệ phương trình sau:

$\left\{\begin{matrix} x^{2}+xy-y^{2}+3y+4=0 & & \\ x^{2}+2xy-y^{2}+11x+6y-2=0 & & \end{matrix}\right.$