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花样繁多的各民族数字
人类学会写字之后,又创造了一些符号来表示数字。用于表示数量的符号就是数字。数字符号很可能是人类发明的最早一批符号。
在大约公元前3500年前,中东的苏美尔人第一个发明了文字和数字。他们用有尖头的树枝、骨头或其他类似笔的东西在泥板上面写字,写出来的文字是木楔形的,所以被称为楔形文字。大约公元前3100年,继承苏美尔人文化的巴比伦人又第一个发明了六十进制。直到今天,在计算时间时,人们用的还是六十进制。当时的人认为地球围绕太阳公转一圈的时间是360天,也就是一年,所以把圆分成360等份。
另一个较早发明数字的是古埃及人。古埃及人在大约公元前3000年发明了象形数字和文字。
一般认为,中国数字和汉字是大约5000年前的华夏族所发明的,但到现在为止所发现的最古老的中国数字和汉字文物是大约公元前1200年的商代甲骨文。
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各个民族的数字符号差异很大。
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