412. При каких значениях а верно равенство: 1) а•5 = 5;
2)a•5=0;
3)a•5=a;
4)a•1=a;
5)a•1=a;
6)a•a=a;
7)0•a=a;
8)0•a=0;
9)a•a=0;
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