Расставьте коэффициенты химических реакций:  1)CaCO3 = CaO + CO2
2)Al + CuCl2 = Cu + AlCl3
3)HCl + MgO = MgCl2 + H20
4)Si + O2 = SiO2
5)Mn2O7 + H2O = HMnO4
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