Răspuns :
7¹ =...7
7² =...9
7³ =...3
7⁴ =...1.
1000:4 = 250. rest 0
8
__
=20
20
__
==0
0
_
=
r = 0 U(7¹⁰⁰⁰) = U(7⁴) = ...1
7² =...9
7³ =...3
7⁴ =...1.
1000:4 = 250. rest 0
8
__
=20
20
__
==0
0
_
=
r = 0 U(7¹⁰⁰⁰) = U(7⁴) = ...1
[tex]U(7^{1000})=U(7^{4 \timex 250})=U[(7^4 )^{250}] = U(2401^{250}) = \boxed{1} [/tex]