f.libvui.comf.libvui.com/lot1/TuyenTapCacSoTapChiToanHocVaTuoiTre_df4911cc6b.pdfTù dinh nghia trên day ra suy ra ngay mot s6 tính chAt dõn giån. Nãu [x] = a thi x = a + d vái
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