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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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