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,y>0
x+y>=2√xy
所以00
所以2