计算:|1/21-1/20|+|1/22-1/21|+|1/23-1/22|...|1/30-1/29|
问题描述:
计算:|1/21-1/20|+|1/22-1/21|+|1/23-1/22|...|1/30-1/29|
答
1/21
计算:|1/21-1/20|+|1/22-1/21|+|1/23-1/22|...|1/30-1/29|
1/21