|2/1-1|+|3/1-2/1|+·····+|99/1-98/1|+|100/1-99/1|=
问题描述：
|2/1-1|+|3/1-2/1|+·····+|99/1-98/1|+|100/1-99/1|=
答
|2/1-1|+|3/1-2/1|+·····+|99/1-98/1|+|100/1-99/1|
=1-2/1+2/1-3/1+……+99/1-100/1
=1-100/1
=100/99