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長方體=abc(長*寬*高) 正方體=aaa(邊長的三次方) 圓柱體=πrrh(h是圓柱的高)(底面積*高) 圓錐體=πrrh/3(三分之一*底面積*高,即同面積的圓柱體體積的三分之一) 球體=4πrrr/3(三分之四*半徑*中心最大圓圓面積)
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