两圆相切时是否存在分别在两圆上的点a,b使得两圆以相反方�,相同速度旋转时a,b之间的距离保持不变? 知乎 Template




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tomski两圆相切时是否存在分别在两圆上的点a,b使得两圆以相反方�,相同速度旋转时a,b之间的距离保持不变? 知乎 coloring