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如圖,因為M,N是線段AB的三等分點,所以NB=13AB=4cm,①當N在靠近B的一端時,又P是NB的中點,所以PB=12NB=2,所以PA=12-2=10cm;②當N在靠近A的一端時,又P是NB的中點,所以P與M重合,所以PA=12-4=8cm.∴PA=10cm或8cm.
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