题有误,应为
1/6+1/12+1/20+1/30+1/42+1/56*1/72+1/90
=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
=1/2-1/10
=0.4