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如图,对称轴为直线x=1的抛物线经过A(﹣1,0)、C(0,3)两点,与x轴的另一个交点为B,点D在y轴上,且OB=3OD (1)求该抛物线的表达式; (2)设该抛物线上的一个动点P的横坐标为t...
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