1+2+3.............+100=幾多
回答 (17)
2006-10-31 5:33 am
✔ 最佳答案
1+2+3.............+100=100(1+100)/2=5050
2006-11-06 12:26 am
1+2+3...........+100=5050
2006-11-04 1:39 am
0+100= 100
1+99 = 100
2+98=100
3+97=100
..................
49+51=100
以上有50次即 50 x 100 = 5000
再加中間的50
答案便是 5000+50
5050
1+99 = 100
2+98=100
3+97=100
..................
49+51=100
以上有50次即 50 x 100 = 5000
再加中間的50
答案便是 5000+50
5050
2006-11-01 6:51 am
口訣:頭項+尾項x項數除2
=1+100x100
----------------
2
10100
=---------
2
=5050
====
=1+100x100
----------------
2
10100
=---------
2
=5050
====
參考: 奧數班
2006-10-31 6:34 am
(1 + n)n/2
=(1 + 100)100/2
=5050
=(1 + 100)100/2
=5050
2006-10-31 5:48 am
5020,because 1+10=45 11+20..............................
2006-10-31 5:35 am
1+2+3.............+100=
100(1+100)/2
=5050
100(1+100)/2
=5050
2006-10-31 5:34 am
(1+100)*100/2
=101*100/2
=101*50
=5050
係5050
=101*100/2
=101*50
=5050
係5050
2006-10-31 5:33 am
{(1+100)x100}/2 = 5050
收錄日期: 2021-04-13 00:24:06
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https://hk.answers.yahoo.com/question/index?qid=20061030000051KK05890