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	Các bình luận về: Đề:    Tìm tập xác định của mỗi hàm số sau:a) $y=\sqrt{x-2\sqrt{x-1}}$                        b) $y=\sqrt{&#124;x-2&#124;+3x-x^2-1}$c) $y=\frac{1}{\sqrt{12x-4x^2-9}}$                                 d) $y=\sqrt{2x-3x^2-1}$	</title>
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