如图,梯形ABCD中,AD//BC,∠A=90°,AB=7,AD=2,BC=3,试在腰AB上确定点P的位置,使得以P,A,D为顶点的行与以P,B,C为顶点的三角形相似.
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![如图,梯形ABCD中,AD//BC,∠A=90°,AB=7,AD=2,BC=3,试在腰AB上确定点P的位置,使得以P,A,D为顶点的行与以P,B,C为顶点的三角形相似.](/uploads/image/z/2578109-5-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%2F%2FBC%2C%E2%88%A0A%3D90%C2%B0%2CAB%3D7%2CAD%3D2%2CBC%3D3%2C%E8%AF%95%E5%9C%A8%E8%85%B0AB%E4%B8%8A%E7%A1%AE%E5%AE%9A%E7%82%B9P%E7%9A%84%E4%BD%8D%E7%BD%AE%2C%E4%BD%BF%E5%BE%97%E4%BB%A5P%2CA%2CD%E4%B8%BA%E9%A1%B6%E7%82%B9%E7%9A%84%E8%A1%8C%E4%B8%8E%E4%BB%A5P%2CB%2CC%E4%B8%BA%E9%A1%B6%E7%82%B9%E7%9A%84%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9B%B8%E4%BC%BC.)
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