For example, the integer 1985 is written as 1985=1×10 3 +9×10 2 +8×10+5 In other words, it is a way of expressing numbers by grouping the 10 numbers 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 into groups of 10 and carrying them up to the next digit. In general, an n- digit integer a n -1 a n -2 … a 1 a 0 means a n -1 10 n -1 + a n -2 10 n -2 + ... + a 1 10 + a 0 , where 0≦ a 0 , a 1 , …, a n -2 ≦9 , 1≦ a n -1 ≦9. This number system is called the base 10 decimal system. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
記数法の一つであって,たとえば,整数 1985は, 1985=1×103+9×102+8×10+5 で表わされる。すなわち,10個の数0,1,2,3,4,5,6,7,8,9を用いて,10ずつひとまとめにして,上の位へ繰上げていく数の表わし方である。一般に n 桁の整数 an-1an-2…a1a0 は,an-110n-1+an-210n-2+…+a110+a0 を意味する。ただし 0≦a0,a1,…,an-2≦9 ,1≦an-1≦9 である。この記数法を 10を底とする十進法という。 出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
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