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圆上动点问题，求BP的最大值是多少？圆O和AB相切时，有最大值
圆上动点问题，求BP的最大值是多少？圆O和AB相切时，才有最大值。
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99/233
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