(2012•益阳)已知:如图,抛物线y=a(x-1)2+c与x轴交于点A(1- 3 ,0)和点B,(2012•益阳)已知:如图,抛物线y=a(x-1)2+c与x轴交于点A(1- 3,0)和点B,将抛物线沿x轴向上翻折,顶点P落在点P
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