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a=2^2017+5^2017+9^2017
afla ultima cifra a lui a REPEDE!!


Răspuns :

a=2^2017+5^2017+9^2017

2017 = 4 × 504 + 1

U(2^2017) = U(2^1) = 2
U(5^2017) = 5
U(9^2017) = 9

U(a) = U(2 + 5 + 9) = U(16) = 6