aflati ultima cifra a nr
![Aflati Ultima Cifra A Nr class=](https://ro-static.z-dn.net/files/d5c/204534bed4a93c9cf4632347008b72c0.jpg)
Răspuns:
a=2⁷¹⁵ + 29³¹
U (2⁷¹⁵) = U [2^(4×178+3)] = U (2³) = 8
U (29³¹) = U(9³¹) = 9
(9 la o putere impara are mereu ultima cifra 9)
Prin urmare: U (a) = U (8+9)=U (17)=7