说明:问题:小明的家里有五口人,他们排成一排照相,那么一共有多少种排法呢,你能不能把所有的排法写出来?
-: Xiao Ming is the home of five, they line up a row of photographs, and then a row the total number of species law, um, You can put all the scheduling was made?
<紫龙> 在 2008-10-13 上传
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