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球的體積V=(4/3)πr^3=32π/3,所以半徑r=2 正方體的體對角線是外接球的直徑,所以體對角線=4 正方體的體對角線是棱長的根號3倍,所以棱長4/根號3=(4/3)根號3 這些邊的關係,你畫個圖就知道了~
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