Question

Ultima cifra a nr lui 11^3+22^3+...+99^3 esteeee

Answer 1

A=11^3+22^3+...+99^3
A=11^3+22^3+33^3+44^3+55^3+66^3+77^3+88^3+99^3
U(11^3)=1
U(22^3)=8
U(33^3)=7
U(44^3)=4
U(55^3)=5
U(66^3)=6
U(77^3)=3
U(88^3)=2
U(99^3)=9
U(1+8+7+4+5+6+3+2+9)=5