H
hunggary


CM::::với mọi a hệ sau luôn có nghiệm::
[TEX]\left{2.x^2 = y + \frac{a^2} { y}\\2.y^2 = x + \frac{a^2} { x}[/TEX]
@-)@-)@-)@-)@-)
[TEX]\left{2.x^2 = y + \frac{a^2} { y}\\2.y^2 = x + \frac{a^2} { x}[/TEX]
@-)@-)@-)@-)@-)
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