如图,在直角梯形ABCD中,∠ABC=90°,AD‖BC,AD=4,AB=5,BC=6,点P是AB上一个动点,当PC+PD的和最小时,PB的长为
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![如图,在直角梯形ABCD中,∠ABC=90°,AD‖BC,AD=4,AB=5,BC=6,点P是AB上一个动点,当PC+PD的和最小时,PB的长为](/uploads/image/z/2779040-56-0.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E7%9B%B4%E8%A7%92%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2C%E2%88%A0ABC%EF%BC%9D90%C2%B0%2CAD%E2%80%96BC%2CAD%EF%BC%9D4%2CAB%EF%BC%9D5%2CBC%EF%BC%9D6%2C%E7%82%B9P%E6%98%AFAB%E4%B8%8A%E4%B8%80%E4%B8%AA%E5%8A%A8%E7%82%B9%2C%E5%BD%93PC%EF%BC%8BPD%E7%9A%84%E5%92%8C%E6%9C%80%E5%B0%8F%E6%97%B6%2CPB%E7%9A%84%E9%95%BF%E4%B8%BA)
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