已知抛物线y=x2+(b-1)x+c经过点p(-1,-2b).(1)求b+c的值;(2)若b=3,求这条抛物线的顶点坐标;(3)若b>3,过点P作直线PA⊥y轴,叫y轴于点A,交抛物线于另一点B,且BP=2PA,求这条抛物线所对应的二次函
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![已知抛物线y=x2+(b-1)x+c经过点p(-1,-2b).(1)求b+c的值;(2)若b=3,求这条抛物线的顶点坐标;(3)若b>3,过点P作直线PA⊥y轴,叫y轴于点A,交抛物线于另一点B,且BP=2PA,求这条抛物线所对应的二次函](/uploads/image/z/11294303-23-3.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dx2%2B%28b-1%29x%2Bc%E7%BB%8F%E8%BF%87%E7%82%B9p%28-1%2C-2b%29.%EF%BC%881%EF%BC%89%E6%B1%82b%2Bc%E7%9A%84%E5%80%BC%EF%BC%9B%EF%BC%882%EF%BC%89%E8%8B%A5b%3D3%2C%E6%B1%82%E8%BF%99%E6%9D%A1%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E9%A1%B6%E7%82%B9%E5%9D%90%E6%A0%87%EF%BC%9B%EF%BC%883%EF%BC%89%E8%8B%A5b%3E3%2C%E8%BF%87%E7%82%B9P%E4%BD%9C%E7%9B%B4%E7%BA%BFPA%E2%8A%A5y%E8%BD%B4%2C%E5%8F%ABy%E8%BD%B4%E4%BA%8E%E7%82%B9A%2C%E4%BA%A4%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%BA%8E%E5%8F%A6%E4%B8%80%E7%82%B9B%2C%E4%B8%94BP%3D2PA%2C%E6%B1%82%E8%BF%99%E6%9D%A1%E6%8A%9B%E7%89%A9%E7%BA%BF%E6%89%80%E5%AF%B9%E5%BA%94%E7%9A%84%E4%BA%8C%E6%AC%A1%E5%87%BD)
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