x＞0,y＞0.且xy-(x+y)=1则xy的范围和x+y的范围

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x＞0,y＞0.且xy-(x+y)=1则xy的范围和x+y的范围x＞0,y＞0.且xy-(x+y)=1则xy的范围和x+y的范围x＞0,y＞0.且xy-(x+y)=1则xy的范围和x+y的范围x>0,

x＞0,y＞0.且xy-(x+y)=1则xy的范围和x+y的范围
x＞0,y＞0.且xy-(x+y)=1则xy的范围和x+y的范围

x＞0,y＞0.且xy-(x+y)=1则xy的范围和x+y的范围
x>0,y>0
x+y>=2√xy
所以00
所以2