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determinati ultima cifra a nr 2 la putrea 2011

Răspuns :

[tex]U(2^{2011})=U(2^3 \cdot 2^{2008})=U(2^3 \cdot (2^4)^{502})=U(8 \cdot 16^{502})= \\ =U(8 \cdot 6)=U(48)=8[/tex]