如图,AB是圆O的直径,AM和BN是它的两条切线,DE切圆O于点E,交AM于点D,交BN于点C,F是CD的中点,连接OF.(1)求证:OD平行于BE(2)猜想:OF与CD有何数量关系?并说明理由
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![如图,AB是圆O的直径,AM和BN是它的两条切线,DE切圆O于点E,交AM于点D,交BN于点C,F是CD的中点,连接OF.(1)求证:OD平行于BE(2)猜想:OF与CD有何数量关系?并说明理由](/uploads/image/z/8578077-69-7.jpg?t=%E5%A6%82%E5%9B%BE%2CAB%E6%98%AF%E5%9C%86O%E7%9A%84%E7%9B%B4%E5%BE%84%2CAM%E5%92%8CBN%E6%98%AF%E5%AE%83%E7%9A%84%E4%B8%A4%E6%9D%A1%E5%88%87%E7%BA%BF%2CDE%E5%88%87%E5%9C%86O%E4%BA%8E%E7%82%B9E%2C%E4%BA%A4AM%E4%BA%8E%E7%82%B9D%2C%E4%BA%A4BN%E4%BA%8E%E7%82%B9C%2CF%E6%98%AFCD%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E8%BF%9E%E6%8E%A5OF.%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9AOD%E5%B9%B3%E8%A1%8C%E4%BA%8EBE%EF%BC%882%EF%BC%89%E7%8C%9C%E6%83%B3%EF%BC%9AOF%E4%B8%8ECD%E6%9C%89%E4%BD%95%E6%95%B0%E9%87%8F%E5%85%B3%E7%B3%BB%3F%E5%B9%B6%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1)
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