1/3*1/4+1/4*1/5+1/5*1/6.........1/99*1/100=?

来源:百度知道 编辑:UC知道 时间:2024/06/06 19:14:41

1/3*1/4+1/4*1/5+1/5*1/6.........1/99*1/100
=(1/3-1/4)+(1/4-1/5)................(1/99-1/100)=1/3-1/100=97/300

因为1/3*1/4=1/3-1/4;1/4*1/5=1/4-1/5;……1/99*1/100=1/99-1/100。
所以,1/3*1/4+1/4*1/5+1/5*1/6+……+1/99*1/100
=(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+……+(1/99-1/100)
=1/3-1/4+1/4-1/5+1/5-1/6+1/6-……+1/98-1/99+1/99-1/100
=1/3-1/100
=97/300

1/3*1/4+1/4*1/5+1/5*1/6+...+1/99*1/100
=(1/3-1/4)+(1/4-1/5)+(1/5*1/6)+...+(1/99-1/100)
=1/3-1/100=97/300

97/300