若实数x.y满足根号x+y-3+(x-2y)^2=0.则根号2xy=

问题描述:

若实数x.y满足根号x+y-3+(x-2y)^2=0.则根号2xy=

根号x+y-3+(x-2y)^2=0
必有:
x+y-3=0
x-2y=0
解得:y=1;x=2
2xy=2*2=4