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最後の計算が3乗のところということならば
2/3 ・((b-a)/2)^3-2/3 ・((a-b)/2)^3
=2/3 ・1/2^3 ・((b-a)^3-(a-b)^3)
=1/12 ・ ((b-a)^3+(b-a)^3)
1/6 ・(b-a)^3

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