1+2+3+4....+10 000*1*2*3/1.5=?

2006-11-16 7:37 pm
1+2+3+4....+10 000*1*2*3/1.5=?

回答 (5)

2006-11-17 12:44 am
✔ 最佳答案
=200020000
2006-11-17 2:12 am
1+2+3+4....+10 000*1*2*3/1.5

=(1+10 000) X 5 000 X 1 X 2 X 3 / 1.5

=10 001 X 5 000 X 1 X 2 X 3 / 1.5

=50 005 000 X (1 X ) X 2 X 3 / 1.5

=100 010 000 X 3 / 1.5

=100 010 000 X (3 / 1.5)

=100 010 000 X 2

=200 020 000
2006-11-16 7:51 pm
1+2+3+4....+10 000*1*2*3/1.5
=sum(1..9999) + 10 000 * 1 * 2 * 3 / 1.5
=sum(1..9999) + 40 000
= 9999 * 5000 + 40 000
= 49 995 000 + 40 000
= 50 035 000

2006-11-18 15:13:06 補充:
點解同一條問題,每個人計的答案都唔一樣咖? -__-...

2006-11-29 01:53:11 補充:
根本就係計錯數。連steps都無,最佳回答?
參考: 先乘除後加減,然後再用 summation rule 就得。
2006-11-16 7:48 pm
先上乘除, 後加減...

1+2+3+4....+9999 +10000*1*2*3/1.5
= (1+9999) + (2+9998)+.....+ (4999+5001) + 5000 + 60000/1.5
= 10000* (10000/2 -1)+5000 +40000
= 10000* 4999 +5000 + 40000
= 50035000

註: 如果 1+2+3+...+9....
= (1+9)+(2+8) + (3+7) +(4+6) +5
= 10* (10/2-1) +5
= 45
將呢樣野apply 落...(1+9999) + (2+9998)+.....+ (4999+5001) + 5000 ...
所以就係等於10000* (10000/2 -1)+5000

2006-11-27 23:59:40 補充:
wrong answer....!!!
2006-11-16 7:42 pm
40024


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