钟表问题(2)(2)
奥数网
2010-05-27 11:10:10
1-1/9
2-2/8
3-3/7
4-4/6
5-10
6-5/1+1/1+2
1-1/9
2-2/8
3-3/7
4-4/6
5-10
6-5/1+1/1+2