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	Các bình luận về: Đề bài: Cho ba số $a,b,c$ thỏa mãn $a\geq 1,b\geq 1,c\geq 1$. Chứng minh rằng:     $\sqrt{(a+1)(b-1)}+\sqrt{(b+1)(c-1)}+\sqrt{(c+1)(a-1)}	</title>
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