August 2021 0 13 Report
Внутри глиняный кирпич пустотелый. Каков вес полости внутри кирпича, который весит 4,5 кг и имеет размеры 25х12х14 см? Плотность почвы 1300 кг / м3. Воздух = 1,29 кг / м3.
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