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УмнаяСова3
@УмнаяСова3
October 2021
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Яка маса сухої соснової дошки завдовжки 3 м, завширшки 20 см ізавтовшки 5 см? *
Вважайте, що густина соснової дошки ρ = 400 кг/м³
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