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由抛物线外点p作切点三角形（阿基米德三角形），记其外心为o，如何证明pf⊥of？ 知乎 Template






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sketch 5085 CM Punk by Luciana Nazar
sketch 3736 Why so serious? by Taï Marsan
sketch 2477 hhhh
sketch 2715 Angelina
sketch 3742 Homer by Koes Maung
sketch 3765 Happy easter!

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sketch 2055 Flower
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sketch 2460 Zayn Malik of One Direction by sketchmaster
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tomski由抛物线外点p作切点三角形（阿基米德三角形），记其外心为o，如何证明pf⊥of？ 知乎 coloring
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由抛物线外点P作切点三角形（阿基米德三角形），记其外心为O，如何证明PF⊥OF？ 知乎 sketch template
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