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	Các bình luận về: Đề bài: chứng minh với mọi số nguyên dương n:a) \(\frac{1}{n+1}+\frac{1}{n+2}+\frac{1}{2n}\geq \frac{1}{2}\)b)\(\frac{1}{1\times 3}+\frac{1}{1\times 3\times 5}+&#8230;+\frac{1}{1\times 3\times 5&#8230;\left ( 2n+1 \right )}	</title>
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