若实数x.y满足根号x+y-3+(x-2y)^2=0.则根号2xy=
人气:359 ℃ 时间:2020-05-21 17:47:21
解答
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
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