1+2+3+4+5........

2007-11-13 9:05 pm

1+2+3+4+5............999+1000

回答 (8)

2007-11-13 9:12 pm

✔ 最佳答案

500500 嗎你地打咁多 12389216.......... 有咩用呀
答案先重要嗎 = =

參考: 腦

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2007-11-13 9:16 pm

找呢條的答案可以用 AP 的公式
頭尾相加除二乘項數
1+2+3+4+5+...+999+1000 = [(1+1000)/2] * 1000 = (1001/2)*1000 = 500500

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2007-11-13 9:13 pm

(1+1000)*(1000/2)
=500500

參考: me

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2007-11-13 9:10 pm

[(1+1000)*1000]/2
=1001000/2
=500500

參考: me

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2007-11-13 9:09 pm

=500500

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2007-11-13 9:09 pm

=[(1+1000) x 1000]/2
=[1001 x 1000]/2
=1001000/2
=500500

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2007-11-13 9:09 pm

(1+1000)*1000/2
=1001*1000/2
=1001000/2
=500500

參考: =

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2007-11-13 9:08 pm

=500,000

參考: 腦

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