Разбор задачи на смеси (концентрация) растворов. Это и 9 и 11 классам.
Попова Виктория Юрьевна, репетитор по математике, 79043431635
matematika_na_piat@
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![Пожалуй, главное заблуждение об электричестве [Veritasium]](https://sun9-39.userapi.com/xbFbEDnVxU0mUJ9eBoK8MLJJtrn9qvG45P9C4A/JUKtvZOHpCs.jpg)
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