👤

A = 7^{2015} + 8^{2016} + 9^{2017}
Aflati ultima cifra al lui A


Răspuns :

U (7³)+ U(8^4)+U(9^1)=u(3+6+9)=U(18)=8



Pt.ca
U(7^n)=7,9,3,1...
U(8^n)=8;4;2;6...
U(9^n) =9;1....