Răspuns :
a³-b³=(a-b)(a²+ab+b²) in progranma de LICEU
atunci
729a³-27b³=27(27a³-b³)=27((3a)³-b³)=27(3a-b)(9a²+3ab+b²)
atunci
729a³-27b³=27(27a³-b³)=27((3a)³-b³)=27(3a-b)(9a²+3ab+b²)