因为罗马数字的12是XII,而罗马数字的7是VII,即在XII中间画一横线,上下就是两个VII,就是阿拉伯数字7了.
同理罗马数字的13是XIII,在XIII中间画一横线,上下就是VIII等于阿拉伯数字8了.
can you prove(证明)half of 12is 7and half of 13is8
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