|1/2-1|+|1/3-1/2|+1/4-1/3|+…….+ |1/100-1/99|
=(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
中间抵消
=1-1/100
=99/100
|1/2-1|+|1/3-1/2|+1/4-1/3|+…….+ |1/100-1/99|
=(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
中间抵消
=1-1/100
=99/100