求|1/10-1/11|+|1/11-1/12|+…+|1/49-1/50|

问题描述:

求|1/10-1/11|+|1/11-1/12|+…+|1/49-1/50|
RT

|1/10-1/11|+|1/11-1/12|+…+|1/49-1/50|
=1/10-1/50
=2/25