1/36么?
1/36+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11=19/426不知对不对?
要是1/30就肯定对
1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11=6/55