20/03/16 18:51:48 thhgKhx4.net
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凸包の期待値=(4π/3)1^3=4π/3=4.1887902……
20/03/16 18:51:48 thhgKhx4.net
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（(-_-)∥ ∥______
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凸包の期待値=(4π/3)1^3=4π/3=4.1887902……