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一个疑问

Posted by welkin_fafnir at 2005-07-21 10:17:34 on Problem 2500 
两个圆内接四边形X和Y，有一个公共点A，X的以A为端点的对角线是直径，Y的以A为端点的对角线不是直径(对角线的另一个端点可以任意取)，是否可以证明当X和Y都剩下的两个顶点任意取，使得X和Y的面积都尽量的大时，总有X的面积不小于Y的面积？
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