帮助

答:1/50000
2/60000
3/80000
4/130000
5/210000
6/320000
7/480000
8/690000
9/960000
10/1300000
11/1710000
12/2210000
13/2800000
14/3480000
15/4270000
16/5170000
17/6190000
18/7340000
19/8620000
20/10000000