已知:在平面直角坐标系中,抛物线y=ax^2-x+3(a≠0)交x轴于A、B两点,交y轴与点C,且对称轴为直角x=-2.(1)求抛物线的解析式及顶点D的坐标;(2)若点P(0,t)是y轴上的一个动点,请进行如下探
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![已知:在平面直角坐标系中,抛物线y=ax^2-x+3(a≠0)交x轴于A、B两点,交y轴与点C,且对称轴为直角x=-2.(1)求抛物线的解析式及顶点D的坐标;(2)若点P(0,t)是y轴上的一个动点,请进行如下探](/uploads/image/z/4099339-19-9.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%9A%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%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%5E2-x%2B3%EF%BC%88a%E2%89%A00%EF%BC%89%E4%BA%A4x%E8%BD%B4%E4%BA%8EA%E3%80%81B%E4%B8%A4%E7%82%B9%2C%E4%BA%A4y%E8%BD%B4%E4%B8%8E%E7%82%B9C%2C%E4%B8%94%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%BA%E7%9B%B4%E8%A7%92x%3D-2.%EF%BC%881%EF%BC%89%E6%B1%82%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%E5%8F%8A%E9%A1%B6%E7%82%B9D%E7%9A%84%E5%9D%90%E6%A0%87%EF%BC%9B%EF%BC%882%EF%BC%89%E8%8B%A5%E7%82%B9P%EF%BC%880%2Ct%EF%BC%89%E6%98%AFy%E8%BD%B4%E4%B8%8A%E7%9A%84%E4%B8%80%E4%B8%AA%E5%8A%A8%E7%82%B9%2C%E8%AF%B7%E8%BF%9B%E8%A1%8C%E5%A6%82%E4%B8%8B%E6%8E%A2)
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