Question

calculati ultimul nr a nr 2015 la puterea 2019+2016 la puterea 2019

Answer 1

2015 are ultima cifra 5 ⇒ $2015^{n}$, n ∈ N* are ultima cifra 5
2016 are ultima cifra 6 ⇒ $2016^{n}$, n ∈ N* are ultima cifra 6

$2015^{n}$=abd5
$2016^{m}$=def6
--------------------------------(+)
$2015^{n}$+$2016^{m}$=xyz1  ⇒ ultima cifra=1