Помогите решить. H2O+Cr
Cs2+H2O
SeO2+H2O
Na2O+HCI
CrO+HNO3
CO2+NaOH
CaO+H3PO4
Ca(OH)2+P2O5
CaO+SO2
Mg+SiO2
BaO+P2O5
Na2O+N2O5
K2O+AL2O3
прошу помочь очень срочно
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