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Juliani, Veronika and Sanjaya, Melania Taradiva Tyarastri and Sri Pratini, Haniek (2023) Preliminary Rresearch pada perancangan Hypothetical Learning Trajectory untuk materi himpunan berbasis Problem Based Learning bagi siswa SMP. In: Seminar Nasional SENDIKA 9 UMP, Department of Mathematics Education Universitas Muhammadiyah Purworejo.