两个相同大小的硬币,一枚硬币固定,另一枚硬币贴紧绕着滚动,那么绕着滚动一圈滚动的硬币自转几圈? 知乎 Template




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tomski两个相同大小的硬币,一枚硬币固定,另一枚硬币贴紧绕着滚动,那么绕着滚动一圈滚动的硬币自转几圈? 知乎 coloring