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determina ultima cifra a numarului 2017
[tex] {2017}^{2017} [/tex]


Răspuns :

u(2017²⁰¹⁷) =?

u(2017¹) = 7 ; u(2017²) = 9 ; u(2017³) = 3 ; u(2017⁴) = 1

2017 = 4 x 504 + 1 => u(2017²⁰¹⁷) = 7