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三人排成一排照相有几种排法
更新时间: 2020-11-04 00:00:00  

3人排成一排照相,一共有6种排法,这道题还可以用全排列求解:A(3,3)=3×2×1=6。

照相是靠"影像铺"这样的店家用传统的画像方法描绘自己的容貌。当时画人叫"小照",画亡灵为"影像"。摄影术传入中国后,人们把这两个词连起来称为"照相"。

关键词: 排成 照相

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