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P是⊙O内一点,过点P作⊙O的任意一条弦AB,我们把PA•PB的值称为点P关于⊙O的“幂值”. (1)⊙O的半径为5,OP=3. ①如图1,若点P恰为弦AB的中点,则点P关于⊙O的“幂值”为 ...
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