1.2/1+6/1+12/1+20/1+30/1+42/1 2.6/1+12/1+20/1+30/1.+9900/1
来源：学生作业帮助网 编辑：六六作业网 时间：2024/05/08 22:24:42
1.2/1+6/1+12/1+20/1+30/1+42/12.6/1+12/1+20/1+30/1.+9900/11.2/1+6/1+12/1+20/1+30/1+42/12.6/1+12/1+20/
1.2/1+6/1+12/1+20/1+30/1+42/1 2.6/1+12/1+20/1+30/1.+9900/1
1.2/1+6/1+12/1+20/1+30/1+42/1 2.6/1+12/1+20/1+30/1.+9900/1
1.2/1+6/1+12/1+20/1+30/1+42/1 2.6/1+12/1+20/1+30/1.+9900/1
1.2/1+6/1+12/1+20/1+30/1+42/1 2.6/1+12/1+20/1+30/1.+9900/1
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/99-1/100)
=1-1/100
=99/100
原式=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/99-1/100)
=1-1/100
=99/100