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如图①矩形ABCD在坐标系中的位置如图所示,OB=3OA=3,BC=5,将线段BC绕点B旋转,使点C落在y轴负半轴上的点E处,抛物线y=ax2+bx+c(a≠0)经过A、B、C三点. (1)求抛物...
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