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【简答题】
如图，AB是⊙O的直径，弦CD⊥AB于E，弦CD、AF相交于点G，过点D作⊙O的切线交AF的延长线于M，且 AC = CBF ． （1）在图中找出相等的线段（直接在横线上填写，所写结论至少3组，所添辅助线段除外，不需 写推理过程）______； （2）连接AD，DF（请将图形补充完整），若AO= 4 5 15 ，OE= 1 5 15 ，求AD：DF的值； （3）在满足（1）、（2）的前提下，求DM的长．
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