Răspuns :
7¹=_7
7²=_9
7³=_3
7⁴=_1
7⁵=_7,observam ca ultima cifra se repeta la un interval de 4
Impartim 2019:4=504+3r, deci ultima cifra a nr 2017²⁰¹⁹ va fi cifra 3.
7²=_9
7³=_3
7⁴=_1
7⁵=_7,observam ca ultima cifra se repeta la un interval de 4
Impartim 2019:4=504+3r, deci ultima cifra a nr 2017²⁰¹⁹ va fi cifra 3.
∅ Răspuns :
U(7¹ ) = 7 → 7
U(7² ) = 49 → 9
U(7³ ) = 343 → 3
U( 7⁴ ) = 2401 → 1
U(7⁵ ) = 16 807 → 7
_______________
2019 : 4 = 504
20
----
== 1
0
-------
19
16
-------
3 rest
→ U(2017²⁰¹⁹ ) → 3
U(7¹ ) = 7 → 7
U(7² ) = 49 → 9
U(7³ ) = 343 → 3
U( 7⁴ ) = 2401 → 1
U(7⁵ ) = 16 807 → 7
_______________
2019 : 4 = 504
20
----
== 1
0
-------
19
16
-------
3 rest
→ U(2017²⁰¹⁹ ) → 3