2002年宜昌数学中考题,圆与直线,动点如图,已知BC是圆的直径,线段RQ∥BC,A是BQ上的任意一点,AF与圆O相切于点F,连结AB与圆O相交于点M,D是AB上的一点,且AD=AF,DE垂直于AB并与AC的延长线交于点E.问:
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![2002年宜昌数学中考题,圆与直线,动点如图,已知BC是圆的直径,线段RQ∥BC,A是BQ上的任意一点,AF与圆O相切于点F,连结AB与圆O相交于点M,D是AB上的一点,且AD=AF,DE垂直于AB并与AC的延长线交于点E.问:](/uploads/image/z/10904202-18-2.jpg?t=2002%E5%B9%B4%E5%AE%9C%E6%98%8C%E6%95%B0%E5%AD%A6%E4%B8%AD%E8%80%83%E9%A2%98%2C%E5%9C%86%E4%B8%8E%E7%9B%B4%E7%BA%BF%2C%E5%8A%A8%E7%82%B9%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5BC%E6%98%AF%E5%9C%86%E7%9A%84%E7%9B%B4%E5%BE%84%2C%E7%BA%BF%E6%AE%B5RQ%E2%88%A5BC%2CA%E6%98%AFBQ%E4%B8%8A%E7%9A%84%E4%BB%BB%E6%84%8F%E4%B8%80%E7%82%B9%2CAF%E4%B8%8E%E5%9C%86O%E7%9B%B8%E5%88%87%E4%BA%8E%E7%82%B9F%2C%E8%BF%9E%E7%BB%93AB%E4%B8%8E%E5%9C%86O%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9M%2CD%E6%98%AFAB%E4%B8%8A%E7%9A%84%E4%B8%80%E7%82%B9%2C%E4%B8%94AD%3DAF%2CDE%E5%9E%82%E7%9B%B4%E4%BA%8EAB%E5%B9%B6%E4%B8%8EAC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%A4%E4%BA%8E%E7%82%B9E.%E9%97%AE%EF%BC%9A)
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