一道错题的分析与修正

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题目四边形ABCD是矩形,点E为射线CB上一点,DE交直线AB于点F,∠AED=2∠CED,点G是DF的中点,若AB=15~(1/2),BC=7,BE=1,则EG的长为____.这是一本中考数学复习资料上提供的习题.本题没有提供图,根据题意,可以分点E在线段CB延长线上和点E在线段BC上两种情况分别画出如下图1和图2.
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