點解個答案係咁ga????please tell me 點計!! please!!
A piece of wire is cut into two at a point selected at random.
The probability that the longer part is at least 4 times
as long as the shorter is 2/5.
math (probability)
2008-10-24 6:55 am
回答 (3)
2008-11-04 7:11 am
✔ 最佳答案
其實我諗個答案錯，或者英文用錯理論上，at least 4 times即係最少四倍，即係４倍都得
咁我地就可以將條繩分做五份，咁就有４個分割點
４個分割點中，只有兩個可以令the longer part is at least 4 times
as long as the shorter
所以就係２／４～＞１／２
但如果個答案冇錯，一係就個at least 4 times唔包括四倍
一係就做答案果條白痴以為要將條繩分做五份要ｃｕｔ五下，咁就會出到２／５呢個答案
唔好以為答案一定岩，我成日同我ｄ學生講要信自己
參考: 我呢個補習老師
2009-03-25 5:23 am
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2008-11-04 7:16 am
你先將佢份成5等份 好似咁-----
佢係 -^---- 或者 ----^- 呢到cut 都可以做成你要既condition
咁就係 1/5 1/5 =2/5
只要佢係 -^---- 既 ^ 既左面cut 都fullfill到你要既condition
而機會就係 1/5. 另一個 ----^- 都一樣
2008-11-03 23:17:58 補充：
我唔係補習老師^^ 但我相信我冇解釋錯
佢係 -^---- 或者 ----^- 呢到cut 都可以做成你要既condition
咁就係 1/5 1/5 =2/5
只要佢係 -^---- 既 ^ 既左面cut 都fullfill到你要既condition
而機會就係 1/5. 另一個 ----^- 都一樣
2008-11-03 23:17:58 補充：
我唔係補習老師^^ 但我相信我冇解釋錯
收錄日期: 2021-04-29 18:03:05
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081023000051KK02384