729a^3+27b^3
(9a)^3+(3b)^3
(9a+3b) [(9a)^2+(3b)^2-9a×3b]
(9a+3b) [81a^2+9b^2-27ab]
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729a^3+27b^3
(9a)^3+(3b)^3
(9a+3b) [(9a)^2+(3b)^2-9a×3b]
(9a+3b) [81a^2+9b^2-27ab]