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从1到100有多少个1

更新时间: 2019-04-03 00:00:00     

21个。1~9中,数字1出现了1次,10~19中,1出现了11次,20~90中,1出现了1×8=8次,100:1次。阿拉伯数字由0,1,2,3,4,5,6,7,8,9共10个计数符号组成。采取位值法,高位在左,低位在右,从左往右书写。借助一些简单的数学符号(小数点、符号、百分号等),这个系统可以明确地表示所有的有理数。为了表示极大或极小的数字,人们在阿拉伯数字的基础上创造了科学记数法。

关键词: 多少

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