Răspuns :
2^77-2^76-2^75=2^75(2^2-2-1)=2^75*1=2^75, care este cubul perfect al lui 2^25
2^77 - 2^76 - 2^75 =
2^75 x (2^2 - 2 - 1 ) =
2^75 x (4 - 2 - 1) =
2^75 x 1 =
2^75 =
(2^25)^3 = > cub perfect
2^75 x (2^2 - 2 - 1 ) =
2^75 x (4 - 2 - 1) =
2^75 x 1 =
2^75 =
(2^25)^3 = > cub perfect