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卖油翁 玩起了数学 之 几何概型

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isee posted 2013-8-22 00:05 |Read mode
Last edited by isee 2013-8-22 20:40需要考虑等可能,不容易得到正确结果


欧阳修《卖油翁》中写到:(翁)乃取一葫芦置于地,以钱覆其口,徐以杓酌油沥之,自钱孔入,而钱不湿.可见“行行出状元”,卖油翁的技艺让人叹为观止.若铜钱是直径为$4cm$的圆面,中间有边长为$1cm$的正方形孔,若随机向铜钱上滴一滴油(油滴不出边界),则油滴整体(油滴是直径为$0.2cm$的球)正好落入孔中的概率是______.(不作近似计算)

来源:2012-2013年湖北孝感高三数学二模 理科

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hongxian posted 2013-8-23 05:51
需要考虑等可能,不容易得到正确结果
isee 发表于 2013-8-22 00:05
什么意思?

$\dfrac{0.8^2}{\pi\cdot1.9^2}$没有考虑等可能?

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original poster isee posted 2013-8-23 08:31
厉害,完全正确

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