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x = 4a * ½b * ⅓c
x = 4 * ½ * ⅓ * abc
x = ⅔abc / :⅔
1,5x = abc
1,5x = 30 / :1,5
x = 20
30 - 20 = 10 [cm³]
Objętość zmniejszy się o 10cm³.
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