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A math problem about absolute value in the first day of junior high school
| 1/2 1- 1/20|+| 1/22- 1/2 1|+| 1/23- 1/22|+...+| 1/35- 1/34|

The denominator is large and small, so add a negative sign before removing the absolute value. )

=- 1/2 1+ 1/20- 1/22+ 1/2 1- 1/23+ 1/22-...- 1/35+ 1/34

= 1/20- 1/35

=3/ 140