计算:|1/21-1/20|+|1/22-1/21|+|1/23-1/22|...|1/30-1/29|

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计算:|1/21-1/20|+|1/22-1/21|+|1/23-1/22|...|1/30-1/29|计算:|1/21-1/20|+|1/22-1/21|+|1/23-1/22|...|1/30-1

计算:|1/21-1/20|+|1/22-1/21|+|1/23-1/22|...|1/30-1/29|
计算:|1/21-1/20|+|1/22-1/21|+|1/23-1/22|...|1/30-1/29|

计算:|1/21-1/20|+|1/22-1/21|+|1/23-1/22|...|1/30-1/29|
1/21

=1/20-1/21+1/21-1/22+1/22-1/23+......+1/29-1/30
=1/20-1/30
=1/60