1!= 1 2!= 2 3!= 6 4!= 24 5! = 120 6! = 720 ... 从5开始,末位数字都是0,所以末尾数字是 1+2+6+24 = 33; 末尾数是3 转载于:https://www.cnblogs.com/springMVC/archive/2009/02/21/2204477.html