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	Các bình luận về: Đề bài: Cho 3 số thực $x,y,z$ thỏa mãn : $\left\{ \begin{array}{l} x^{2}+xy+y^{2}=3  \\ y^{2} +yz+z^{2}=16  \end{array} \right. $Chứng minh rằng $-8 \leq xy+yz+zx \leq 8$	</title>
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