Suggest three ways to get aluminum oxide. Confirm the answer with the reaction equations.

1) 4Al + 3O2 = 2Al2O3 (when aluminum interacts with oxygen, aluminum oxide is formed);

2) 4Al (NO3) 3 = 2Al2O3 + 12NO2 + 3O2 (when aluminum nitrate decomposes, aluminum oxide, nitrogen oxide and oxygen are formed);

3) Fe2O3 + 2Al = Al2O3 + 2Fe (when iron (III) oxide interacts with aluminum, aluminum oxide and iron are formed).

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