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Укажите тип химический реакций
(соединение\ разложение \ замещение) (овр\ не овр)
1) 2K3PO4 + 3MgSO4 = Mg3(PO4)2 +3K2SO4
2) K2O + H2O = 2KOH
3)2KHCO3 = K2CO3 + CO2 = H2O
4) 3MgCl2 + AI = 3Mg + AICI3
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