已知抛物线ax^2+bx+c的顶点坐标E(1,0),与y轴交点坐标为(0,1).(1),求抛物线的函数关系式.(y=x^2-2x+1)(2),A.B是x轴上2个动点,AB距离为4,作AD垂直x轴,BC垂直x轴交抛物线于D,C,设A坐标(t,0),四边形
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![已知抛物线ax^2+bx+c的顶点坐标E(1,0),与y轴交点坐标为(0,1).(1),求抛物线的函数关系式.(y=x^2-2x+1)(2),A.B是x轴上2个动点,AB距离为4,作AD垂直x轴,BC垂直x轴交抛物线于D,C,设A坐标(t,0),四边形](/uploads/image/z/4490409-57-9.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFax%5E2%2Bbx%2Bc%E7%9A%84%E9%A1%B6%E7%82%B9%E5%9D%90%E6%A0%87E%281%2C0%29%2C%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E7%82%B9%E5%9D%90%E6%A0%87%E4%B8%BA%280%2C1%29.%EF%BC%881%EF%BC%89%2C%E6%B1%82%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E5%87%BD%E6%95%B0%E5%85%B3%E7%B3%BB%E5%BC%8F.%EF%BC%88y%3Dx%5E2-2x%2B1%EF%BC%89%EF%BC%882%EF%BC%89%2CA.B%E6%98%AFx%E8%BD%B4%E4%B8%8A2%E4%B8%AA%E5%8A%A8%E7%82%B9%2CAB%E8%B7%9D%E7%A6%BB%E4%B8%BA4%2C%E4%BD%9CAD%E5%9E%82%E7%9B%B4x%E8%BD%B4%2CBC%E5%9E%82%E7%9B%B4x%E8%BD%B4%E4%BA%A4%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%BA%8ED%2CC%2C%E8%AE%BEA%E5%9D%90%E6%A0%87%EF%BC%88t%2C0%EF%BC%89%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2)
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