如图,在梯形ABCD中,AD平行BC,AB=DC=AD=3,角ABC=60°,点E,F分别在线段AD,DC上(点E不与A.D重合),且角BEF=120°,设AE=x,DF=Y.求(1)求Y关于x的函数解析式,及x取值范围(2)当x为何值时,y有最大值,最大值是
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![如图,在梯形ABCD中,AD平行BC,AB=DC=AD=3,角ABC=60°,点E,F分别在线段AD,DC上(点E不与A.D重合),且角BEF=120°,设AE=x,DF=Y.求(1)求Y关于x的函数解析式,及x取值范围(2)当x为何值时,y有最大值,最大值是](/uploads/image/z/1781240-32-0.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%E5%B9%B3%E8%A1%8CBC%2CAB%3DDC%3DAD%3D3%2C%E8%A7%92ABC%3D60%C2%B0%2C%E7%82%B9E%2CF%E5%88%86%E5%88%AB%E5%9C%A8%E7%BA%BF%E6%AE%B5AD%2CDC%E4%B8%8A%EF%BC%88%E7%82%B9E%E4%B8%8D%E4%B8%8EA.D%E9%87%8D%E5%90%88%EF%BC%89%2C%E4%B8%94%E8%A7%92BEF%3D120%C2%B0%2C%E8%AE%BEAE%3Dx%2CDF%3DY.%E6%B1%82%EF%BC%881%EF%BC%89%E6%B1%82Y%E5%85%B3%E4%BA%8Ex%E7%9A%84%E5%87%BD%E6%95%B0%E8%A7%A3%E6%9E%90%E5%BC%8F%2C%E5%8F%8Ax%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%882%EF%BC%89%E5%BD%93x%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2Cy%E6%9C%89%E6%9C%80%E5%A4%A7%E5%80%BC%2C%E6%9C%80%E5%A4%A7%E5%80%BC%E6%98%AF)
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