如图,在平面直角坐标系中,顶点为(4,-1)的抛物线交Y轴于A点,交X轴于B,C两点(B在C的左侧).已知A点坐标为(0,3).1.求抛物线的解析式2.过点B作线段AB的垂线交抛物线于点D(D在X轴上方),如
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![如图,在平面直角坐标系中,顶点为(4,-1)的抛物线交Y轴于A点,交X轴于B,C两点(B在C的左侧).已知A点坐标为(0,3).1.求抛物线的解析式2.过点B作线段AB的垂线交抛物线于点D(D在X轴上方),如](/uploads/image/z/5261421-21-1.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB%E4%B8%AD%2C%E9%A1%B6%E7%82%B9%E4%B8%BA%284%2C-1%29%E7%9A%84%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%BA%A4Y%E8%BD%B4%E4%BA%8EA%E7%82%B9%2C%E4%BA%A4X%E8%BD%B4%E4%BA%8EB%2CC%E4%B8%A4%E7%82%B9%EF%BC%88B%E5%9C%A8C%E7%9A%84%E5%B7%A6%E4%BE%A7%EF%BC%89.%E5%B7%B2%E7%9F%A5A%E7%82%B9%E5%9D%90%E6%A0%87%E4%B8%BA%EF%BC%880%2C3%EF%BC%89%EF%BC%8E1%EF%BC%8E%E6%B1%82%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F2%EF%BC%8E%E8%BF%87%E7%82%B9B%E4%BD%9C%E7%BA%BF%E6%AE%B5AB%E7%9A%84%E5%9E%82%E7%BA%BF%E4%BA%A4%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%BA%8E%E7%82%B9D%EF%BC%88D%E5%9C%A8X%E8%BD%B4%E4%B8%8A%E6%96%B9%EF%BC%89%2C%E5%A6%82)
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