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【简答题】
已知在△ABC中,∠ABC=90°,AB=3,BC=4.点Q是线段AC上的一个动点,过点Q作AC的垂线交线段AB(如图1)或线段AB的延长线(如图2)P. (1)当点P在线段AB上时,求证:△APQ∽△ABC; (2)当△PQB为等腰三角形时,求AP的长.
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