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中考冲刺填空压轴题，翻折产生动点问题，难度系数四星半，怎么做
14、如图，在Rt△ABC中，∠C=90°，AC=4，AB=8，点D是BC的中点，点E是AB上一点，将△BDE沿DE折叠，使点B落在点F处，线段DF交斜边AB于点G，当△AFG是直角三角形时，则AF的长为____
中考压轴题合集21/108
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