By the middle on the 2nd millennium BC, Babylonian arithmetic had a complicated base 60 positional numeral program. The shortage of a positional value (or zero) was indicated by an area concerning sexagesimal numerals.?? ki?m tra tr?ng thái chuy?n hàng c?a b?n. Thông tin chi ti?t theo th?i gian th?c t? ti?n ?? chuy?n hàng. H? TR? TR?C TUY?NPack