October 2021 0 0 Report
40 БАЛЛОВ!!!! P2O5 => H3PO4 => K2HPO4 => KH2PO4 => K3PO4 (Помогите пожалуйста осуществить цепочку превращения)
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vysota pachki doski 166sm shirina 217sm skolko kubov v pachke doski
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