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正方體的的體對角線即為外接圓的直徑.因為正方體有六個面,每個面的面積為4,可得邊長為2,體對角線為2根號3,所以球的半徑為根號3,球的體積為(4/3)X3.14X3根號3=12.56根號3.最後的結果你用小算盘算一下
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