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PENINGKATAN AKTIVITAS BELAJAR SISWA MATA PELAJARAN IPA MATERI CAHAYA DAN SIFAT-SIFATNYA MELALUI KOMBINASI MODEL PEMBELAJARAN PROBLEM SOLVING, NUMBERED HEAD TOGETHER (NHT), DAN WORD SQUARE SISWA KELAS V SDN SUNGAI RANGAS ULU KECAMATAN MATAPURA BARAT