在平面直角坐标系XOY中,抛物线y=x平方+bx+c与x轴交于A,B两点(点A在点B左侧),与y轴交于点C,点B的坐标为(3,0),将直线y=kx沿y轴向上平移3个单位长度后恰好经过B,C两点.抛物线顶点为D.连接CD,求角
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![在平面直角坐标系XOY中,抛物线y=x平方+bx+c与x轴交于A,B两点(点A在点B左侧),与y轴交于点C,点B的坐标为(3,0),将直线y=kx沿y轴向上平移3个单位长度后恰好经过B,C两点.抛物线顶点为D.连接CD,求角](/uploads/image/z/3023892-36-2.jpg?t=%E5%9C%A8%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BBXOY%E4%B8%AD%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dx%E5%B9%B3%E6%96%B9%2Bbx%2Bc%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8EA%2CB%E4%B8%A4%E7%82%B9%EF%BC%88%E7%82%B9A%E5%9C%A8%E7%82%B9B%E5%B7%A6%E4%BE%A7%EF%BC%89%2C%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9C%2C%E7%82%B9B%E7%9A%84%E5%9D%90%E6%A0%87%E4%B8%BA%EF%BC%883%2C0%29%2C%E5%B0%86%E7%9B%B4%E7%BA%BFy%3Dkx%E6%B2%BFy%E8%BD%B4%E5%90%91%E4%B8%8A%E5%B9%B3%E7%A7%BB3%E4%B8%AA%E5%8D%95%E4%BD%8D%E9%95%BF%E5%BA%A6%E5%90%8E%E6%81%B0%E5%A5%BD%E7%BB%8F%E8%BF%87B%2CC%E4%B8%A4%E7%82%B9.%E6%8A%9B%E7%89%A9%E7%BA%BF%E9%A1%B6%E7%82%B9%E4%B8%BAD.%E8%BF%9E%E6%8E%A5CD%2C%E6%B1%82%E8%A7%92)
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