阿瑞斯伟大的故事:数学竞赛

来源:百度文库 编辑:高校问答 时间:2024/05/03 10:28:11
1/1*2+1/2*3+1/3*4+。。。+1/99*100=?

1/1*2+1/2*3+1/3*4+。。。+1/99*100
=(1/1 -1/2)+(1/2 -1/3)+(1/3-1/4)+……+(1/99 -1/100)
=1-1/100
=99/100

1/1*2+1/2*3+1/3*4+。。。+1/99*100
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/99-1/100)
=1-1/2+1/2-1/3+1/3-1/4+……+1/99-1/100
=1-1/100
=99/100

1/1*2+1/2*3+1/3*4+。。。+1/99*100
=(1/1 -1/2)+(1/2 -1/3)+(1/3-1/4)+……+(1/99 -1/100)
=1-1/100
=99/100

1/1*2+1/2*3+1/3*4+。。。+1/99*100
=(1/1 -1/2)+(1/2 -1/3)+(1/3-1/4)+……+(1/99 -1/100)
=1-1/100
=99/100

1/1*2+1/2*3+1/3*4+。。。+1/99*100
=(1/1 -1/2)+(1/2 -1/3)+(1/3-1/4)+……+(1/99 -1/100)
=1-1/100
=99/100

1/1*2+1/2*3+1/3*4+……+1/99*100
=1-1/2+1/2-1/3+1/3-1/4+1/4-……+1/99-1/100
=1-1/100
=99/100