求教数学三角形证明题图一:等腰三角形ABC,AB=AC,BD垂直AC,求角DBC与角A的关系图二:等腰三角形ABC中AB=AC,DE垂直AC,DF垂直AB,CH垂直AB,求证ED,DF与CH的关系
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![求教数学三角形证明题图一:等腰三角形ABC,AB=AC,BD垂直AC,求角DBC与角A的关系图二:等腰三角形ABC中AB=AC,DE垂直AC,DF垂直AB,CH垂直AB,求证ED,DF与CH的关系](/uploads/image/z/1720868-68-8.jpg?t=%E6%B1%82%E6%95%99%E6%95%B0%E5%AD%A6%E4%B8%89%E8%A7%92%E5%BD%A2%E8%AF%81%E6%98%8E%E9%A2%98%E5%9B%BE%E4%B8%80%EF%BC%9A%E7%AD%89%E8%85%B0%E4%B8%89%E8%A7%92%E5%BD%A2ABC%2CAB%3DAC%2CBD%E5%9E%82%E7%9B%B4AC%2C%E6%B1%82%E8%A7%92DBC%E4%B8%8E%E8%A7%92A%E7%9A%84%E5%85%B3%E7%B3%BB%E5%9B%BE%E4%BA%8C%EF%BC%9A%E7%AD%89%E8%85%B0%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%ADAB%3DAC%2CDE%E5%9E%82%E7%9B%B4AC%2CDF%E5%9E%82%E7%9B%B4AB%2CCH%E5%9E%82%E7%9B%B4AB%2C%E6%B1%82%E8%AF%81ED%2CDF%E4%B8%8ECH%E7%9A%84%E5%85%B3%E7%B3%BB)
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