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Выбрать из предложенных реакций реакции обмена, составить уравнения,расставив коэффициенты.
1) NaOH+H3PO4=Na3PO4+H20
2)Cu(OH)2=CuO+H20
3)Al+CuCl2=AlCl3+Cu
4)Cu+O2=CuO
5)Al2O3+HCl=AlCl3+H20
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