1.已知1、x,3分别为等腰三角形的三边长,试画简|5-3x|+|13-4x|=_______.(请说明为什么要这样做,理由,)2.点D,E在△ABC的边BC上,AD=AE,BD=EC.求证:AB=AC.(具体步骤)3.在△ABC中,AD平分∠BAC,且AB+BD=AC.求证:
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![1.已知1、x,3分别为等腰三角形的三边长,试画简|5-3x|+|13-4x|=_______.(请说明为什么要这样做,理由,)2.点D,E在△ABC的边BC上,AD=AE,BD=EC.求证:AB=AC.(具体步骤)3.在△ABC中,AD平分∠BAC,且AB+BD=AC.求证:](/uploads/image/z/12062229-69-9.jpg?t=1.%E5%B7%B2%E7%9F%A51%E3%80%81x%2C3%E5%88%86%E5%88%AB%E4%B8%BA%E7%AD%89%E8%85%B0%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9A%84%E4%B8%89%E8%BE%B9%E9%95%BF%2C%E8%AF%95%E7%94%BB%E7%AE%80%7C5-3x%7C%2B%7C13-4x%7C%3D_______.%28%E8%AF%B7%E8%AF%B4%E6%98%8E%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E8%BF%99%E6%A0%B7%E5%81%9A%2C%E7%90%86%E7%94%B1%2C%292.%E7%82%B9D%2CE%E5%9C%A8%E2%96%B3ABC%E7%9A%84%E8%BE%B9BC%E4%B8%8A%2CAD%3DAE%2CBD%3DEC.%E6%B1%82%E8%AF%81%EF%BC%9AAB%3DAC.%EF%BC%88%E5%85%B7%E4%BD%93%E6%AD%A5%E9%AA%A4%EF%BC%893.%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAD%E5%B9%B3%E5%88%86%E2%88%A0BAC%2C%E4%B8%94AB%2BBD%3DAC.%E6%B1%82%E8%AF%81%EF%BC%9A)
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