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	Các bình luận về: Đề: Với những giá trị nào của $x$ thì các biểu thức sau có nghĩaa) $\sqrt[6]{2x-4}+\sqrt[8]{2-x}  $                                                b) $\sqrt[4]{2x^2-x-1} $c) $\sqrt[5]{\frac{2x+1}{6-3x} }. $	</title>
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