August 2021 1 11 Report
сплав цинка и свинца, весом 180 кг. содержится 20% свинца.. найти вес цинка и свинца .. сколько  процентов цинка в сплаве ?какой  процент  составляет вес свинца от веса цинкка ??       Vv ребят помогите , умоляю.
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