1-1/2-1/3-1/4-1/5-1/6-1/7-1/8-1/9-1/10
=(1-1/2-1/3-1/6)-(1/4+1/8)-(1/5+1/10)-1/7-1/9
=0-3/8-3/10-1/7-1/9
=-2341/2520
1-1/2-1/3-1/4-1/5-1/6-1/7-1/8-1/9-1/10
=(1-1/2-1/3-1/6)-(1/4+1/8)-(1/5+1/10)-1/7-1/9
=0-3/8-3/10-1/7-1/9
=-2341/2520
这种题目要自己算,这样才会发现规律,知道了吗!!!