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