三进制是
哎呀我不懂怎样解释
就是
0 = 0
1 = 1
2 = 2
3 = 10
4 = 11
5 = 12
6 = 20
7 = 21
8 = 22
9 = 100
10 = 101
11 = 102
12 = 110
13 = 111
14 = 112
15 = 120
总之就是你的数字不能出现3,4,5,6,7,8,9
七进制就是
0 = 0
1 = 1
2 = 2
3 = 3
4 = 4
5 = 5
6 = 6
7 = 10
8 = 11
9 = 12
10 = 13
11 = 14
12 = 15
13 = 16
14 = 20
15 = 21
总之就是你的数字不能有7,8,9
(●'◡'●)