已知三角形ABC的三个顶点都在圆O上,AB=AC,D是BC上一点,E是直线AD与圆的交点,如图1所示(1)试说明AB^2=ADxAE(2)当D为BC延长线上一点时,如图2,第(1)题的结论还成立吗?说明理由.第二问的
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![已知三角形ABC的三个顶点都在圆O上,AB=AC,D是BC上一点,E是直线AD与圆的交点,如图1所示(1)试说明AB^2=ADxAE(2)当D为BC延长线上一点时,如图2,第(1)题的结论还成立吗?说明理由.第二问的](/uploads/image/z/8879069-29-9.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E4%B8%89%E4%B8%AA%E9%A1%B6%E7%82%B9%E9%83%BD%E5%9C%A8%E5%9C%86O%E4%B8%8A%2CAB%EF%BC%9DAC%2CD%E6%98%AFBC%E4%B8%8A%E4%B8%80%E7%82%B9%2CE%E6%98%AF%E7%9B%B4%E7%BA%BFAD%E4%B8%8E%E5%9C%86%E7%9A%84%E4%BA%A4%E7%82%B9%2C%E5%A6%82%E5%9B%BE1%E6%89%80%E7%A4%BA%EF%BC%881%EF%BC%89%E8%AF%95%E8%AF%B4%E6%98%8EAB%EF%BC%BE2%EF%BC%9DADxAE%EF%BC%882%EF%BC%89%E5%BD%93D%E4%B8%BABC%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8A%E4%B8%80%E7%82%B9%E6%97%B6%2C%E5%A6%82%E5%9B%BE2%2C%E7%AC%AC%EF%BC%881%EF%BC%89%E9%A2%98%E7%9A%84%E7%BB%93%E8%AE%BA%E8%BF%98%E6%88%90%E7%AB%8B%E5%90%97%3F%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1.%E7%AC%AC%E4%BA%8C%E9%97%AE%E7%9A%84)
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