在三角形ABC中,角A=90°,AB=AC,D是BC的中点,E,F分别是AB,CA的延长线的点,BE=AF,三角形DEF是否为等腰三角形?
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![在三角形ABC中,角A=90°,AB=AC,D是BC的中点,E,F分别是AB,CA的延长线的点,BE=AF,三角形DEF是否为等腰三角形?](/uploads/image/z/6867773-53-3.jpg?t=%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E8%A7%92A%3D90%C2%B0%2CAB%3DAC%2CD%E6%98%AFBC%E7%9A%84%E4%B8%AD%E7%82%B9%2CE%2CF%E5%88%86%E5%88%AB%E6%98%AFAB%2CCA%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E7%9A%84%E7%82%B9%2CBE%3DAF%2C%E4%B8%89%E8%A7%92%E5%BD%A2DEF%E6%98%AF%E5%90%A6%E4%B8%BA%E7%AD%89%E8%85%B0%E4%B8%89%E8%A7%92%E5%BD%A2%3F)
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