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[chieckhantiennu]

Giải hệ 

1.

$\left\{\begin{matrix}(x-y)(x-1)(y-1)(xy+x+y)=4 & \\  x^2+y^2=4& \end{matrix}\right.$

2. 

$\left\{\begin{matrix}(x-y+2\sqrt{xy})(y-x)x^2=1 & \\  \sqrt{2xy+(y-2x)(x+2\sqrt{xy}-4)}+\sqrt{y-x}=2x+\sqrt{x}& \end{matrix}\right.$

Edited by chieckhantiennu, 11-03-2016 - 23:28.