Question

Ultima cifra a nr 2019 la puterea 2018​

Answer 1

Răspuns:

Explicație pas cu pas:

u(2019²⁰¹⁸) = ?

u(2019¹) = 9 ; u(2019²) = 1

u(2019 la putere impara) = 9

u(2019 la putere para) = 1

u(2019²⁰¹⁸) = 1

Answer 2

$\mathrm{U(2019^{2018}) = U(9^{2018}) =U\big((9^2)^{1009} \big) = U(81^{1009} ) } = \\ \\= \mathrm{U(1^{1009})} = \boxed{1}$