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	Các bình luận về: Đề bài: Dùng bất đẳng thức Cô-si, tìm GTNN:a)$y=x+\frac{3}{x}; (x&gt;0) $                                               b) GTNN $y=x+\frac{2}{x-3}; (x&gt;3) $c) $y=5^{x+1}+5^{x-2} $                                                d) $y=\frac{2 x^{2}+3x+7 }{x} . (x&gt;0)$	</title>
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