若x,y满足根号4x-5y+根号x-y-1

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若x,y满足根号4x-5y+根号x-y-1
若x,y满足根号4x-5y+根号x-y-1

若x,y满足根号4x-5y+根号x-y-1
由非负性:
4x-5y=0,x-y-1=0
解得x=5,y=4
√xy-√x/y
=√5·4-√5/4
=2√5-√5/2
=3√5/2