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MENINGKATKAN HASIL BELAJAR IPA MATERI ENERGI PANAS DAN ENERGI BUNYI MENGGUNAKAN MODEL CONTEXTUAL TEACHING AND LEARNING (CTL) DIKOMBINASIKAN DENGAN MODEL GROUP INVESTIGATION (GI) DAN MODEL NUMBERED HEAD TOGETHER (NHT) PADA SISWA KELAS IV SDN TAMBAK BARU ILIR KABUPATEN BANJAR