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=
答
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