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	Các bình luận về: Cho \(x,y\) là các số thực thỏa mãn \({\log _4}\left( {x + 2y} \right) + {\log _4}\left( {x &#8211; 2y} \right) = 1\). Có bao nhiêu cặp số nguyên \(\left( {x;y} \right)\) để giá trị lớn nhất của biểu thức \(f\left( {x,y} \right) = \left&#124; x \right&#124; &#8211; \left&#124; y \right&#124;\) bằng 2.
A. \(0\).	B. \(1\).	C. \(2\).	D. \(3\).	</title>
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