LOG2(X+Y)=LOG2X+LOG2Y求X+Y的范围
1个回答
由X+Y=XY,得到1/x+1/y=1,
所以x+y=(x+y)(1/x+1/y)=2+x/y+/x>=4.其中用到基本不等式,
等号成立的条件是x=y=根号2.
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