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	Các bình luận về: Đề bài: Chứng minh rằng:$\sqrt{a}\leq \underbrace { \sqrt{a+\sqrt{a+&#8230;+\sqrt{a}}}}_{n}&lt; \frac{1+\sqrt{4a+1}}{2}$,với $\forall a \geq 0,n \in Z, n\geq 2$	</title>
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