1+2+3+4+5+6+7+8+10+11+12+13+14+15+16+17+18+19+20=?
回答 (29)
2007-05-04 4:03 am
✔ 最佳答案
(頭+尾)x項數/2
2007-05-06 2:07 am
1+2+3+4+5+6+7+8+10+11+12+13+14+15+16+17+18+19+20=201
1+2+3+4+5+6+7+8+9+10=55
1+2+3+4+5=15
1+2+3+4+5+6+7+8+9+10=55
1+2+3+4+5=15
2007-05-05 2:35 am
1+2+3+4+5+6+7+8+10+11+12+13+14+15+16+17+18+19+20
=201.0
=201.0
2007-05-04 4:24 pm
210 ...
是210...
還是210...
是210...
還是210...
2007-05-04 4:08 am
答案是=220
2007-05-04 4:04 am
公式:
(頭 + 尾)x 項數
----------------------
2
咁即係
(1 + 20)x 20
------------------
2
答案係 210
(頭 + 尾)x 項數
----------------------
2
咁即係
(1 + 20)x 20
------------------
2
答案係 210
2007-05-04 4:04 am
1+2+3+......+18+19+20
=(1+21)x20
--------------
2
=420
---------
2
=210
=(1+21)x20
--------------
2
=420
---------
2
=210
2007-05-04 4:04 am
It's210
2007-05-04 4:04 am
答案係=210
收錄日期: 2021-04-12 20:26:45
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070503000051KK03514