1/1415+1/1516+1/1617+1/1718

来源：学生作业帮助网编辑：六六作业网时间：2024/12/24 11:48:12

1/14*15+1/15*16+1/16*17+1/17*181/14*15+1/15*16+1/16*17+1/17*181/14*15+1/15*16+1/16*17+1/17*181/(14*1

1/14*15+1/15*16+1/16*17+1/17*18
1/14*15+1/15*16+1/16*17+1/17*18

1/14*15+1/15*16+1/16*17+1/17*18
1/(14*15)+1/(15*16)+1/(16*17)+1/(17*18)
=1/14-1/15+1/15-1/16+1/16-1/17+1/17-1/18
=1/14-1/18
=1/63