October 2021 0 17 Report
1задание. Каким элементом является Х? Ar(О)=16
Оксиды............w(Х) в оксиде
ХО.......................80%
Варианты: а)12с б)64сu в)56fe г)40са е)65zn
2задание. На фотографии.
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