Question

Determinați ultima cifră a numerelor :2 la puterea 2017, 7 la puterea 2020, 5 la puterea 2018
Ajutor plsssss​

Answer 1

Răspuns:

$u( {2}^{2017} ) = u( {2}^{7} ) = u(128) = 8$

$u( {7}^{2020} ) = u( {7}^{0} ) = 1$

$u( {5}^{2018} = u( {5}^{8} ) = 5$