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九年级数学：P是抛物线上一点，圆P与直线y=0相切，怎么求P点坐标
九年级数学：P是抛物线上一点，圆P与直线y=0相切，怎么求P点坐标
初中数学，圆的计算和证明，垂径定理，圆周角圆心角，切线，扇形68/233
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