好難 thank you
回答 (7)
2006-10-20 12:27 am
✔ 最佳答案
1+2+3+4+5+6+7+8+9+10 ................+200 1=(1+2001)(2001)/2
=2002(2001)/2
=1001(2001)
=2003001
2006-10-20 12:39 am
ANS.: 2,002,000 //
2006-10-20 12:29 am
1+2+3+4+5+6+7+8+9+10................+2001=?
1+2+3+4+5+6+7+8+9+10................+2001=
1 + (2+2001) * 1000 =
1 + 2003000 =
2003001
1+2+3+4+5+6+7+8+9+10................+2001=
1 + (2+2001) * 1000 =
1 + 2003000 =
2003001
2006-10-20 12:28 am
用以用公式︰
1+2+3+.....+n = n*(1+n)/2
1+2+3+......+2001=2001*(1+2001)/2=2,003,001
1+2+3+.....+n = n*(1+n)/2
1+2+3+......+2001=2001*(1+2001)/2=2,003,001
2006-10-20 12:28 am
(1+2001)*2001/2=2003001
2006-10-20 12:27 am
2001000
dont copy my ans.
dont copy my ans.
2006-10-20 12:26 am
=2001000
收錄日期: 2021-04-12 18:09:12
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061019000051KK01966