Масса 45 см3 алюминия 121.5 г.найдите массу 20 см3 алюминия.
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08.03.2019 08:40
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составляем пропорцию 45/121,5=20/х
отсюда находим х= 121,5*20/45=54 г
1) 121,5 х 20 : 45 = 54 грамма 20 куб.см алюминия.