ЕГЭ 2020 Химия. Марганец: степени окисления от -3 до +7
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![СДАЙ ЕГЭ! [Игорь Войтенко]](https://sun9-57.userapi.com/TQu60VWPMQsEZBlKRThTt7PAEBdhXRC5-R5CJQ/fhG8Z59N2Zk.jpg)
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