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	Các bình luận về: Đề bài: Cho $2$  số dương $a,b$ thỏa mãn: $\frac{a}{x}+\frac{b}{y}=1$ với $a,y&gt;0$.Tìm $x,y$ để:$S=x+y$ nhỏ nhất ( tính theo $a,b$)	</title>
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