|1/21-1/20|+|1/22-1/21|+|1/23-1/22|+...+|1/2004-1/2003|
|1/21-1/20|+|1/22-1/21|+|1/23-1/22|+...+|1/2004-1/2003|
| |是绝对值
| |是绝对值
赞 mingchylee 幼苗
共回答了23个问题采纳率：91.3% 举报
|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
=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
1年前
8
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1年前12个回答
你能帮帮他们吗