正四面体abcd内接于半径为r的球o(即四个顶点在球面上),其内切球半径为r,(1)证明r=3r (2)用r表 百度知道 Template




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tomski正四面体abcd内接于半径为r的球o(即四个顶点在球面上),其内切球半径为r,(1)证明r=3r (2)用r表 百度知道 coloring