1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20....+30=?
2008-09-26 3:36 am
1+2+3+4+5+6+7+8+9+10............................................+30=?
回答 (14)
2008-09-30 2:14 am
✔ 最佳答案
1+2+3+4+5+6+7+8+9+10............................................+30=? =465
參考: me
2008-09-26 5:05 am
1+2+3+4+5+6+7+8+9+10............................................+30
=(1+30) X 30/2
=31X15
=465
=(1+30) X 30/2
=31X15
=465
參考: 我
2008-09-26 4:18 am
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20....+30=465
2008-09-26 3:54 am
1 2 3 4 5 6 7 8 9 10............................................ 30=?
It`s easy.
1 2 3 4 5 6 7 8 9 10............................................ 30
=(1 2 3 4 5 6 7 8 9 10..................................................... 30
30 29 28 27 26 25 24 23 22 21 20................................ 1)
=31*30/2
=930/2
=465
It`s easy.
1 2 3 4 5 6 7 8 9 10............................................ 30
=(1 2 3 4 5 6 7 8 9 10..................................................... 30
30 29 28 27 26 25 24 23 22 21 20................................ 1)
=31*30/2
=930/2
=465
2008-09-26 3:49 am
(頭 尾)乘項數
--------------------
2
(1 30)乘30
-------------
2
31×30
--------
2
930/2
=465(項數姐係有幾多個數)eg:1+2+3有３個,2+4+6有3個
2008-09-25 19:50:31 補充：
--------------
2
(係解除2
--------------------
2
(1 30)乘30
-------------
2
31×30
--------
2
930/2
=465(項數姐係有幾多個數)eg:1+2+3有３個,2+4+6有3個
2008-09-25 19:50:31 補充：
--------------
2
(係解除2
2008-09-26 3:40 am
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20....+30=465
2008-09-26 3:39 am
The answer is 528.
2008-09-25 19:43:53 補充：
Sorry!正確的答案是465。
2008-09-25 19:43:53 補充：
Sorry!正確的答案是465。
2008-09-26 3:39 am
1+2+3+4+5+6+7+8+9+10............................................+30
=465
=465
參考: 自己
收錄日期: 2021-04-13 16:06:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080925000051KK01585