Răspunsuri

2014-11-16T15:01:17+02:00
U(5^1)=5     u(5^2)=5 ⇒u(5^7)=5
u(6^1)=6      u(6^2)=6⇒u(6^2005)=6
u(11^1)=1     u(11^2)=1⇒u(11^2004)=1

⇒u(5^7)+u(6^2005)+u(11^2004)= 5+6+1=12 ⇒ 2∉ multimii ultimei cifre a patratelor perfecte.⇒ numarul nu este patrat perfect

5 4 5