两圆交于a,b,过ab延长线上点p作两圆的4条切线,如何证明不是弦的切点连线交点分别为内外位似中心? 知乎 Template




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tomski两圆交于a,b,过ab延长线上点p作两圆的4条切线,如何证明不是弦的切点连线交点分别为内外位似中心? 知乎 coloring