|1/21-1/20|+|1/22-1/21|+|1/23-1/22|+...+|1/2004-1/2003|
问题描述:
|1/21-1/20|+|1/22-1/21|+|1/23-1/22|+...+|1/2004-1/2003|
| |是绝对值
答
|1/21-1/20|+|1/22-1/21|+|1/23-1/22|+...+|1/2004-1/2003|=1/20-1/21+1/21-1/22+1/22-1/23+...+1/2003-1/2004=1/20-1/2004=501/10020-5/10020=496/10020=124/2505