Question

Aratati ca daca un numar natural are ultima cifra 2,3,7 sau 8 atunci nu este patrat perfect

Answer 1

[tex]u(0^0)=0 \\ u(1^1)=1 \\ u(2^2)=4 \\ u(3^2)=9 \\ u(4^2)=6 \\ u(5^2)=5 \\ u(6^2)=6 \\ u(7^2)=9 \\ u(8^2)=4 \\ u(9^2)=1 \\ u(10^2)=0 \\ u(11^2)=1 \\ u(12^2)=4 \\ u(13^2)=9 \\ Observam~ca~nu~exista~p.p~cu~ultima~cifra~2,3,7~sau~8[/tex]