在三角形ABC中AB=AC,D是BC上的任意一点,过D分别向AB,AC引垂线,垂足分别为E,F,CG是AB边上的高线.1)DE,DF,CG的长之间存在怎样的等量关系?并加以说明;2)若D在底边的延长线上,(1)中的结论还存
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![在三角形ABC中AB=AC,D是BC上的任意一点,过D分别向AB,AC引垂线,垂足分别为E,F,CG是AB边上的高线.1)DE,DF,CG的长之间存在怎样的等量关系?并加以说明;2)若D在底边的延长线上,(1)中的结论还存](/uploads/image/z/13896477-45-7.jpg?t=%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%ADAB%3DAC%2CD%E6%98%AFBC%E4%B8%8A%E7%9A%84%E4%BB%BB%E6%84%8F%E4%B8%80%E7%82%B9%2C%E8%BF%87D%E5%88%86%E5%88%AB%E5%90%91AB%2CAC%E5%BC%95%E5%9E%82%E7%BA%BF%2C%E5%9E%82%E8%B6%B3%E5%88%86%E5%88%AB%E4%B8%BAE%2CF%2CCG%E6%98%AFAB%E8%BE%B9%E4%B8%8A%E7%9A%84%E9%AB%98%E7%BA%BF.1%29DE%2CDF%2CCG%E7%9A%84%E9%95%BF%E4%B9%8B%E9%97%B4%E5%AD%98%E5%9C%A8%E6%80%8E%E6%A0%B7%E7%9A%84%E7%AD%89%E9%87%8F%E5%85%B3%E7%B3%BB%EF%BC%9F%E5%B9%B6%E5%8A%A0%E4%BB%A5%E8%AF%B4%E6%98%8E%EF%BC%9B2%EF%BC%89%E8%8B%A5D%E5%9C%A8%E5%BA%95%E8%BE%B9%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8A%EF%BC%8C%EF%BC%881%EF%BC%89%E4%B8%AD%E7%9A%84%E7%BB%93%E8%AE%BA%E8%BF%98%E5%AD%98)
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