An infinitely continuing decimal, such as 0.33333... when 1/3 is expressed as a decimal. There are two types of infinite decimals: repeating decimals, in which a certain number of digits from a certain decimal place onwards appear in the same order, and non-repeating decimals. Repeating decimals are numbers that are separated by dots and periods, as follows: Repeating decimals represent fractions (rational numbers), for example 0.6=21/37, 0.3=19/55. In contrast, non-repeating infinitesimals represent irrational numbers. For example, [Tatsuro Miwa] Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
1/3を小数に表したときの0.33333……のように限りなく続く小数のこと。 無限小数には、小数のある桁(けた)からあとは何個かの数字が同じ順に繰り返して現れる循環小数と、循環しない小数とがある。循環小数は、循環する部分(循環節)を点・で挟んで、 循環小数は、分数(有理数)を表す。たとえば0.6=21/37,0.3=19/55。 これに対して、循環しない無限小数は無理数を表す。たとえば、 [三輪辰郎] 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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