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	Các bình luận về: Đề bài: Cho $n$ số thực $a_{1}, a_2, &#8230;,a_n$ thuộc đoạn $[-1;1]$ thoả mãn:  $a_{1}^3+ a_2^3+&#8230;a_n^3=0$.Chứng minh rằng $a_{1}+ a_2+&#8230;a_n\leq \frac{n}{3}$	</title>
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