PENGARUH MODEL PEMBELAJARAN PROBLEM BASED LEARNING TERHADAP HASIL BELAJAR MATEMATIKA PESERTA DIDIK KELAS IX. JSSR [Internet]. 2026 Oct. 7 [cited 2026 Oct. 7];9(5):7549 – 7557. Available from: https://jurnal.goretanpena.com/index.php/JSSR/article/view/7178