如图正方形ABCD,AE//BD,BE=BD,BE交AD于F点,求证:DE=DF图片地址:http://592771343.qzone.qq.com?url=http%3A//imgcache.qq.com/qzone/client/photo/pages/qzone_v4/photo_list.htm%3F1.0.2.2%26a_id%3Da95c2c46-8f28-4cf1-b3f4-bf50b0eb81c0%23a_id%3Da9

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如图正方形ABCD,AE//BD,BE=BD,BE交AD于F点,求证:DE=DF图片地址:http://592771343.qzone.qq.com?url=http%3A//imgcache.qq.com/qzone/client/photo/pages/qzone_v4/photo_list.htm%3F1.0.2.2%26a_id%3Da95c2c46-8f28-4cf1-b3f4-bf50b0eb81c0%23a_id%3Da9
如图正方形ABCD,AE//BD,BE=BD,BE交AD于F点,求证:DE=DF
图片地址:
http://592771343.qzone.qq.com?url=http%3A//imgcache.qq.com/qzone/client/photo/pages/qzone_v4/photo_list.htm%3F1.0.2.2%26a_id%3Da95c2c46-8f28-4cf1-b3f4-bf50b0eb81c0%23a_id%3Da95c2c46-8f28-4cf1-b3f4-bf50b0eb81c0

如图正方形ABCD,AE//BD,BE=BD,BE交AD于F点,求证:DE=DF图片地址:http://592771343.qzone.qq.com?url=http%3A//imgcache.qq.com/qzone/client/photo/pages/qzone_v4/photo_list.htm%3F1.0.2.2%26a_id%3Da95c2c46-8f28-4cf1-b3f4-bf50b0eb81c0%23a_id%3Da9
令正方形的边长为1
则BE=BD=根号2
AE//BD 于是