July 2022 1 11 Report
Комнатные растения можно поливать подкормкой из минеральных удобрений: в 1 л воды растворяют 2,5 г KN03, 2,5 г КН2Р04 и 10 г Ca(N03)2. Какова массовая доля (в %) каждого из компонентов в такой подкормке?
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