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边长比为789的三角形中，有三条抛物线d，e，f，它们分别内切于三个问它们的焦点可以重合么？ 知乎 Template






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tomski边长比为789的三角形中，有三条抛物线d，e，f，它们分别内切于三个问它们的焦点可以重合么？ 知乎 coloring
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