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TOMBANG S. MENINGKATKAN HASIL BELAJAR MATEMATIKA MELALUI METODE PROBLEM BASED INSTRUCTION DI KELAS X SMK NEGERI 1 TANJUNG PALAS TAHUN 2017/2018. vocational [Internet]. 2021Sep.6 [cited 2026Mar.11];1(3):180-4. Available from: https://www.jurnalp4i.com/index.php/vocational/article/view/468