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MENINGKATKAN HASIL BELAJAR IPA MATERI CAHAYA DAN SIFAT-SIFATNYA MELALUI KOMBINASI MODEL PEMBELAJARAN DIRECT INSTRUCTION (DI), NUMBER HEAD TOGETHER (NHT) DAN COURSE REVIEW HORAY (CRH) PADA KELAS V-A SDN ANTASAN BESAR 1 KOTABANJARMASIN