求证圆的外接圆半径为定值已知半径为R、r(R>r)的两个圆内切于点A,直径AE的垂线分别交两个圆于B、C两点,且B、C都在AE的同一侧,求证三角形ABC的外接圆的半径是一个定值.
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![求证圆的外接圆半径为定值已知半径为R、r(R>r)的两个圆内切于点A,直径AE的垂线分别交两个圆于B、C两点,且B、C都在AE的同一侧,求证三角形ABC的外接圆的半径是一个定值.](/uploads/image/z/13914797-5-7.jpg?t=%E6%B1%82%E8%AF%81%E5%9C%86%E7%9A%84%E5%A4%96%E6%8E%A5%E5%9C%86%E5%8D%8A%E5%BE%84%E4%B8%BA%E5%AE%9A%E5%80%BC%E5%B7%B2%E7%9F%A5%E5%8D%8A%E5%BE%84%E4%B8%BAR%E3%80%81r%EF%BC%88R%3Er%EF%BC%89%E7%9A%84%E4%B8%A4%E4%B8%AA%E5%9C%86%E5%86%85%E5%88%87%E4%BA%8E%E7%82%B9A%2C%E7%9B%B4%E5%BE%84AE%E7%9A%84%E5%9E%82%E7%BA%BF%E5%88%86%E5%88%AB%E4%BA%A4%E4%B8%A4%E4%B8%AA%E5%9C%86%E4%BA%8EB%E3%80%81C%E4%B8%A4%E7%82%B9%2C%E4%B8%94B%E3%80%81C%E9%83%BD%E5%9C%A8AE%E7%9A%84%E5%90%8C%E4%B8%80%E4%BE%A7%2C%E6%B1%82%E8%AF%81%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E5%A4%96%E6%8E%A5%E5%9C%86%E7%9A%84%E5%8D%8A%E5%BE%84%E6%98%AF%E4%B8%80%E4%B8%AA%E5%AE%9A%E5%80%BC.)
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