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已知实数x,y满足x+2根号y=2,化简二次根式根号2x+y.
人气:288 ℃ 时间:2019-08-21 18:25:30
解答
x+2根号y=2,
x=2-2根号y
根号2x+y
=根号(4-4根号y+y)
=根号(根号y-2)^2
=|根号y-2|
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