=1/2-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)
=1/2-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8
=1/8
解原式=（1-1/2)-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)-(1/6+1/7)+(1/7+1/8) -
=1+1/8
=9/8
内容全部来源于网络收集，如有侵权，请联系网站删除：QQ：24596024