内容导航:
用2、5、7、9这四个数字最多能组成多少个不同的四位数?
2579,2597,2759,2795,2957,2975.
5279,5297,5729,5792,5927,5972.
7259,7295,7529,7592,7925,7952.
9257,9275,9527,9572,9725,9752
共24个
2579,2597,2759,2795,2957,2975.
5279,5297,5729,5792,5927,5972.
7259,7295,7529,7592,7925,7952.
9257,9275,9527,9572,9725,9752
共24个