麻烦写出具体的思路,A、B、C、D是平面上四个互异点,且满足(向量DB+向量DC-2向量DA)*(向量AB-向量AC)=0,则△ABC的形状是( )A.直角三角形B.等腰三角形C.等腰直角三角形D.等边三角形
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![麻烦写出具体的思路,A、B、C、D是平面上四个互异点,且满足(向量DB+向量DC-2向量DA)*(向量AB-向量AC)=0,则△ABC的形状是( )A.直角三角形B.等腰三角形C.等腰直角三角形D.等边三角形](/uploads/image/z/12875836-4-6.jpg?t=%E9%BA%BB%E7%83%A6%E5%86%99%E5%87%BA%E5%85%B7%E4%BD%93%E7%9A%84%E6%80%9D%E8%B7%AF%2CA%E3%80%81B%E3%80%81C%E3%80%81D%E6%98%AF%E5%B9%B3%E9%9D%A2%E4%B8%8A%E5%9B%9B%E4%B8%AA%E4%BA%92%E5%BC%82%E7%82%B9%2C%E4%B8%94%E6%BB%A1%E8%B6%B3%EF%BC%88%E5%90%91%E9%87%8FDB%2B%E5%90%91%E9%87%8FDC-2%E5%90%91%E9%87%8FDA%EF%BC%89%2A%EF%BC%88%E5%90%91%E9%87%8FAB-%E5%90%91%E9%87%8FAC%EF%BC%89%3D0%2C%E5%88%99%E2%96%B3ABC%E7%9A%84%E5%BD%A2%E7%8A%B6%E6%98%AF%EF%BC%88+%EF%BC%89A.%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2B.%E7%AD%89%E8%85%B0%E4%B8%89%E8%A7%92%E5%BD%A2C.%E7%AD%89%E8%85%B0%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2D.%E7%AD%89%E8%BE%B9%E4%B8%89%E8%A7%92%E5%BD%A2)
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