设x,y为正实数,且xy-(x+y)=1,则 ( )A.x+y2+2 B.xy+1 C.x+... 问题详情:设x,y为正实数,且xy-(x+y)=1,则 ( )A.x+y2+2 B.xy+1 C.x+y(+1)2 D.xy2+2【回答】A知识点:不等式题型:选择题...