已知开口向下的抛物线y=ax^2+bx+c与x轴交与m、n两点(点n在点m的右侧),并且m和n两点的横坐标恰是方程x^2-2x-3=0的两个根,点k是抛物线与y轴的交点,∠mkn等于90° 1)求m、n的值;2)求a的值;3)
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![已知开口向下的抛物线y=ax^2+bx+c与x轴交与m、n两点(点n在点m的右侧),并且m和n两点的横坐标恰是方程x^2-2x-3=0的两个根,点k是抛物线与y轴的交点,∠mkn等于90° 1)求m、n的值;2)求a的值;3)](/uploads/image/z/8797720-40-0.jpg?t=%E5%B7%B2%E7%9F%A5%E5%BC%80%E5%8F%A3%E5%90%91%E4%B8%8B%E7%9A%84%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%5E2%2Bbx%2Bc%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%B8%8Em%E3%80%81n%E4%B8%A4%E7%82%B9%EF%BC%88%E7%82%B9n%E5%9C%A8%E7%82%B9m%E7%9A%84%E5%8F%B3%E4%BE%A7%EF%BC%89%2C%E5%B9%B6%E4%B8%94m%E5%92%8Cn%E4%B8%A4%E7%82%B9%E7%9A%84%E6%A8%AA%E5%9D%90%E6%A0%87%E6%81%B0%E6%98%AF%E6%96%B9%E7%A8%8Bx%5E2-2x-3%3D0%E7%9A%84%E4%B8%A4%E4%B8%AA%E6%A0%B9%2C%E7%82%B9k%E6%98%AF%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8Ey%E8%BD%B4%E7%9A%84%E4%BA%A4%E7%82%B9%2C%E2%88%A0mkn%E7%AD%89%E4%BA%8E90%C2%B0+1%EF%BC%89%E6%B1%82m%E3%80%81n%E7%9A%84%E5%80%BC%EF%BC%9B2%EF%BC%89%E6%B1%82a%E7%9A%84%E5%80%BC%EF%BC%9B3%EF%BC%89)
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