高一二次函数题.1.已知二次函数y=a(x-1\2)²+25的最大值为25,且方程a(x-1\2)²+25=0两根的立方和为19,求函数表达式.2.已知二次函数y=ax²+bx+c的图像经过点(-1,-1),其对称轴为x=-2,且在x轴上
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![高一二次函数题.1.已知二次函数y=a(x-1\2)²+25的最大值为25,且方程a(x-1\2)²+25=0两根的立方和为19,求函数表达式.2.已知二次函数y=ax²+bx+c的图像经过点(-1,-1),其对称轴为x=-2,且在x轴上](/uploads/image/z/14968792-64-2.jpg?t=%E9%AB%98%E4%B8%80%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E9%A2%98.1.%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Da%28x-1%5C2%29%26%23178%3B%2B25%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E4%B8%BA25%2C%E4%B8%94%E6%96%B9%E7%A8%8Ba%28x-1%5C2%29%26%23178%3B%2B25%3D0%E4%B8%A4%E6%A0%B9%E7%9A%84%E7%AB%8B%E6%96%B9%E5%92%8C%E4%B8%BA19%2C%E6%B1%82%E5%87%BD%E6%95%B0%E8%A1%A8%E8%BE%BE%E5%BC%8F.2.%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dax%26%23178%3B%2Bbx%2Bc%E7%9A%84%E5%9B%BE%E5%83%8F%E7%BB%8F%E8%BF%87%E7%82%B9%EF%BC%88-1%2C-1%EF%BC%89%2C%E5%85%B6%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%BAx%3D-2%2C%E4%B8%94%E5%9C%A8x%E8%BD%B4%E4%B8%8A)
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