1-1/2+1/3-1/4+1/5+1/6+1/7-----------+1/199-1/200jijiji

1-1/2+1/3-1/4+1/5+1/6+1/7-----------+1/199-1/200jijiji
1-1/2+1/3-1/4+1/5+1/6+1/7-----------+1/199-1/200
jijiji

1-1/2+1/3-1/4+1/5+1/6+1/7-----------+1/199-1/200jijiji
http://www.szttt.com.cn/question.asp?id=2980
这里有具体的解答,套公式就可以了