t已知:三角形ABC中,角BAC=90°,AB=AC,过点A作直线MN,分别过点B,C向直线MN作垂线,BD,E为垂足,则BD,CE,DE这三条线段在数量上有什么关系?请说明你的猜想的正确性.还有下面那种图,
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![t已知:三角形ABC中,角BAC=90°,AB=AC,过点A作直线MN,分别过点B,C向直线MN作垂线,BD,E为垂足,则BD,CE,DE这三条线段在数量上有什么关系?请说明你的猜想的正确性.还有下面那种图,](/uploads/image/z/4973817-57-7.jpg?t=t%E5%B7%B2%E7%9F%A5%3A%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E8%A7%92BAC%3D90%C2%B0%2CAB%3DAC%2C%E8%BF%87%E7%82%B9A%E4%BD%9C%E7%9B%B4%E7%BA%BFMN%2C%E5%88%86%E5%88%AB%E8%BF%87%E7%82%B9B%2CC%E5%90%91%E7%9B%B4%E7%BA%BFMN%E4%BD%9C%E5%9E%82%E7%BA%BF%2CBD%2CE%E4%B8%BA%E5%9E%82%E8%B6%B3%2C%E5%88%99BD%2CCE%2CDE%E8%BF%99%E4%B8%89%E6%9D%A1%E7%BA%BF%E6%AE%B5%E5%9C%A8%E6%95%B0%E9%87%8F%E4%B8%8A%E6%9C%89%E4%BB%80%E4%B9%88%E5%85%B3%E7%B3%BB%3F%E8%AF%B7%E8%AF%B4%E6%98%8E%E4%BD%A0%E7%9A%84%E7%8C%9C%E6%83%B3%E7%9A%84%E6%AD%A3%E7%A1%AE%E6%80%A7.%E8%BF%98%E6%9C%89%E4%B8%8B%E9%9D%A2%E9%82%A3%E7%A7%8D%E5%9B%BE%EF%BC%8C)
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