已知抛物线y =ax2 +bx +c的对称轴为x=2,且经过点(1,4)和点(5,0),则该抛物线的解析式为要求写出过程.
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![已知抛物线y =ax2 +bx +c的对称轴为x=2,且经过点(1,4)和点(5,0),则该抛物线的解析式为要求写出过程.](/uploads/image/z/3815141-5-1.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy+%3Dax2+%2Bbx+%2Bc%E7%9A%84%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%BAx%3D2%2C%E4%B8%94%E7%BB%8F%E8%BF%87%E7%82%B9%281%2C4%29%E5%92%8C%E7%82%B9%285%2C0%29%2C%E5%88%99%E8%AF%A5%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%E4%B8%BA%E8%A6%81%E6%B1%82%E5%86%99%E5%87%BA%E8%BF%87%E7%A8%8B.)
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