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18有几个一
更新时间: 2020-11-04 00:00:00  

18里面有一个十和8个一,18=1×10+8×1,数位是指一个数的每个数字所占的位置。

数位是指写数时,把数字并列排成横列,一个数字占有一个位置,这些位置,都叫做数位。从右端算起,第一位是“个位”,第二位是“十位”。

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