Designing a Smart Flipped Collective Learning Model for Reducing Conceptual Errors Based on APOS Theory: A Case Study on Linear Equations with Female Students in District 2 of Tehran Somayeh Babaeisadr, Esmaeil Yousefi*, Abolfazl Tehranian, Ahmad Shahvarani Semnani, Somaeyh Khalashi Ghezelahmad, 10.57647/ijm2c.2026.1602.10 Requires Subscription PDF downloads: 67