December 2021 1 12 Report
В сплаве, масса которого равна 250г, содержится 20 г  меди. А) Во сколько раз масса сплава больше, чем  меди  в нём? Б) Какую часть составляет от сплава медь?  В) Каково процентное содержание меди в сплаве?​
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