初四数学题、二次函数的1.顶点为(-2,-5)且过点(1,-14)的抛物线的解析式为________2.对称轴是y轴且过点A(1,3)B(-2,-6)的抛物线的解析式为________3.抛物线y=-2x²+4x+1在x轴上截得的线段长
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![初四数学题、二次函数的1.顶点为(-2,-5)且过点(1,-14)的抛物线的解析式为________2.对称轴是y轴且过点A(1,3)B(-2,-6)的抛物线的解析式为________3.抛物线y=-2x²+4x+1在x轴上截得的线段长](/uploads/image/z/6606013-13-3.jpg?t=%E5%88%9D%E5%9B%9B%E6%95%B0%E5%AD%A6%E9%A2%98%E3%80%81%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E7%9A%841.%E9%A1%B6%E7%82%B9%E4%B8%BA%EF%BC%88-2%2C-5%EF%BC%89%E4%B8%94%E8%BF%87%E7%82%B9%EF%BC%881%2C-14%EF%BC%89%E7%9A%84%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%E4%B8%BA________2.%E5%AF%B9%E7%A7%B0%E8%BD%B4%E6%98%AFy%E8%BD%B4%E4%B8%94%E8%BF%87%E7%82%B9A%EF%BC%881%2C3%EF%BC%89B%EF%BC%88-2%2C-6%EF%BC%89%E7%9A%84%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%E4%B8%BA________3.%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-2x%26sup2%3B%2B4x%2B1%E5%9C%A8x%E8%BD%B4%E4%B8%8A%E6%88%AA%E5%BE%97%E7%9A%84%E7%BA%BF%E6%AE%B5%E9%95%BF)
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