Question

Aratati ca a=2^9+3^9+4^9+4=nu este patrat perfect....VA ROOOG!!

Answer 1

$u( {4}^{9} ) = 4$
$u( {3}^{9} ) = 3$
$u( {2}^{9} ) = 2$

$u( {2}^{9} + {3}^{9} + {4}^{9} + 4) = 2 + 3 + 4 + 4 = 3$

==>a nu este patrat perfect.