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表面積公式:S=6×(棱長×棱長) 字母:S=6a²; 長方體表面積公式:S=(長×寬+長×高+寬×高)×2 或:S=長×寬×2+長×高×2+寬×高×2 字母:S=2(ab+ah+bh) 或:S=2ab+2ah+2bh
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