Errors in understanding the meaning of letters in algebraic assignments by university students. Uniciencia, [S. l.], v. 35, n. 1, p. 1–18, 2021. DOI: 10.15359/ru.35-1.1. Disponível em: https://www.revistas.una.ac.cr/index.php/uniciencia/article/view/14385.. Acesso em: 29 apr. 2024.