第1个回答 2021-07-14
解:根据题意列式得
3×3×2×1=18(个)
答:可以摆出18个不同的四位数,按从小到大的顺序排列为:2046,2064,2406,2460,2604,2640,4026,4062,4206,4260,4602,4620,6024,6042,6204,6240,6402,6420。
第2个回答 2021-07-14
2046,2049,2064,2094,2406,2409,2460,2490,2604,2640,2904,2940,4026,4029,4062,4092,4206,4209,4260,4290,4602,4620,4902,4920,6024,6042,6204,6240,6402,6420,9024,9042,9204,9240,9402,9420。
第3个回答 2021-07-14
可以组成无重复数字的四位数有C(3,1)×A(3,3)=3×3×2×1=18个