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	Các bình luận về: Các số thực dương \(x\) và \(y\) thỏa mãn \({\log _3}\frac{{{x^2} + 2xy + {y^2}}}{{{{\left( {{x^2} + {y^2} + xy + 2} \right)}^2}}} = {x^2} + {y^2} &#8211; 3\left( {x + y} \right) + xy\). Biểu thức \(S = {x^2} + {y^2}\) có giá trị lớn nhất bằng&#160;	</title>
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