不要复制的21(本题10分)已知二次函数y=-x2+4x+5图像交x轴于点A、B,交y轴于点C,点D是该函数图像上一点,且点D的横坐标为4,连BD,点P是AB上一动点(不与点A重合),过P作PQ⊥AB交射线AD于点Q,以PQ
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![不要复制的21(本题10分)已知二次函数y=-x2+4x+5图像交x轴于点A、B,交y轴于点C,点D是该函数图像上一点,且点D的横坐标为4,连BD,点P是AB上一动点(不与点A重合),过P作PQ⊥AB交射线AD于点Q,以PQ](/uploads/image/z/7679945-65-5.jpg?t=%E4%B8%8D%E8%A6%81%E5%A4%8D%E5%88%B6%E7%9A%8421%EF%BC%88%E6%9C%AC%E9%A2%9810%E5%88%86%EF%BC%89%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3D%EF%BC%8Dx2%2B4x%2B5%E5%9B%BE%E5%83%8F%E4%BA%A4x%E8%BD%B4%E4%BA%8E%E7%82%B9A%E3%80%81B%2C%E4%BA%A4y%E8%BD%B4%E4%BA%8E%E7%82%B9C%2C%E7%82%B9D%E6%98%AF%E8%AF%A5%E5%87%BD%E6%95%B0%E5%9B%BE%E5%83%8F%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E4%B8%94%E7%82%B9D%E7%9A%84%E6%A8%AA%E5%9D%90%E6%A0%87%E4%B8%BA4%2C%E8%BF%9EBD%2C%E7%82%B9P%E6%98%AFAB%E4%B8%8A%E4%B8%80%E5%8A%A8%E7%82%B9%EF%BC%88%E4%B8%8D%E4%B8%8E%E7%82%B9A%E9%87%8D%E5%90%88%EF%BC%89%2C%E8%BF%87P%E4%BD%9CPQ%E2%8A%A5AB%E4%BA%A4%E5%B0%84%E7%BA%BFAD%E4%BA%8E%E7%82%B9Q%2C%E4%BB%A5PQ)
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