如图,在三角形ABCD中,AB=AC,AD垂直于BC,垂足为点D,AN是三角形ABC外角CAM的平分线,CE垂直于AN,垂足为点E求证四边形ADCE为矩形《要有因为所以的符号
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![如图,在三角形ABCD中,AB=AC,AD垂直于BC,垂足为点D,AN是三角形ABC外角CAM的平分线,CE垂直于AN,垂足为点E求证四边形ADCE为矩形《要有因为所以的符号](/uploads/image/z/5337516-12-6.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABCD%E4%B8%AD%2CAB%3DAC%2CAD%E5%9E%82%E7%9B%B4%E4%BA%8EBC%2C%E5%9E%82%E8%B6%B3%E4%B8%BA%E7%82%B9D%2CAN%E6%98%AF%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E5%A4%96%E8%A7%92CAM%E7%9A%84%E5%B9%B3%E5%88%86%E7%BA%BF%2CCE%E5%9E%82%E7%9B%B4%E4%BA%8EAN%2C%E5%9E%82%E8%B6%B3%E4%B8%BA%E7%82%B9E%E6%B1%82%E8%AF%81%E5%9B%9B%E8%BE%B9%E5%BD%A2ADCE%E4%B8%BA%E7%9F%A9%E5%BD%A2%E3%80%8A%E8%A6%81%E6%9C%89%E5%9B%A0%E4%B8%BA%E6%89%80%E4%BB%A5%E7%9A%84%E7%AC%A6%E5%8F%B7)
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