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	Các bình luận về: Đề: Tìm điều kiện xác định của biểu thức:$a) 3x \sqrt{1-3x}+5x^2 \sqrt{7x+2}                   b) \frac{3x-1}{\sqrt{12-3x} }+ \frac{\sqrt{5x+1} }{x-1}  $$c) \frac{1}{\sqrt{2x+2} }+ \frac{\sqrt{x^2+1} }{3x-3}+\frac{\sqrt{2x-1} }{x+7}.   $	</title>
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