如何证明:过三角形abc的三个顶点作其外接圆切线,分别和各对边所在直线交于一点,则三交点共线? 知乎 Template




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tomski如何证明:过三角形abc的三个顶点作其外接圆切线,分别和各对边所在直线交于一点,则三交点共线? 知乎 coloring