个人觉得提问者可能有个+ -号搞错了,应是:1-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90-21/110+23/132=1-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8-1/8-1/9+1/9+1/10-1/10-1/11+1/11+1/12=7/12...