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cum se rezolva u(3^108)

Răspuns :

108 = 4×27+0
U(3^108) = U(3^4) = U(81) = 1

[tex]\it 3^{108} = (3^4)^{27} = 81^{27} \\\;\\ u(81^{27})=1 \Longrightarrow u(3^{108}) = 1[/tex]