2(1+2+3+4+5........+100)=?
回答 (4)
2008-09-15 6:17 pm
2(1+2+3+4+5........+100)=2 x 1/2(100)(1+100)
=10100//
=10100//
2008-09-14 12:43 am
1+到100
100+1=101
99+2=101
3+98=101
4=97=101
.
.
.
50+51=101
50x101=1+到100
(1+2+3+4+5........+100)=5050
5050x2=10100
一係你咁
((1+100)x100)/2=5050
2x5050=10100
100+1=101
99+2=101
3+98=101
4=97=101
.
.
.
50+51=101
50x101=1+到100
(1+2+3+4+5........+100)=5050
5050x2=10100
一係你咁
((1+100)x100)/2=5050
2x5050=10100
2008-09-13 10:17 pm
2 times 4950 =9900
收錄日期: 2021-04-23 20:34:17
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080913000051KK01165