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Algebra Elemental Moderna

By M.O.Gonzales Y J.D. Mancill. Editorial Pedagogica "Freire" Riobamba- Ecuador 9978801367

By Cisneros Abedrabbo, Gabriel. Ecuador Editorial Pedagógica Freire 2024 21x29cm.. 978-9942-7265-8-2

By Cisneros Abedrabbo, Gabriel. Ecuador Editorial Pedagógica Freire 2025 21x29cm.. 978-9942-7335-8-0

By Jaime Cerrón Palomino . Riobamba - Ecuador pedagógica freire 2012 . 275 pág.