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x＞1/2，y＞1,2xy-2x-y=1，则2x+y的最小值为？两种方法两个思路
x＞1/2，y＞1,2xy-2x-y=1，则2x+y的最小值为？两种方法两个思路
高中数学基本不等式，看你72变，我不变应万变6/18
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