VISUAL PROOF OF $a^3+b^3+c^3-3abc=(a+b+c)(a^2+b^2+c^2-ab-bc-ca)$. Far East Journal of Mathematical Education, [S. l.], v. 24, p. 13–14, 2023. DOI: 10.17654/0973563123005. Disponível em: https://pphmjopenaccess.com/fejme/article/view/140. Acesso em: 5 jan. 2026.