| 在不平地面上把椅子放稳的充分必要条件 |
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| 引用本文： | 赵彦晖. 在不平地面上把椅子放稳的充分必要条件[J]. 数学的实践与认识, 1999, 29(3): 62-65 |
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| 作者姓名： | 赵彦晖 |
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| 作者单位： | 西安建筑科技大学,西安,710055 |
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| 摘 要： | 把椅子放在不平的地面上,通常只有三只脚着地,放不稳,然而只需稍挪动几次,就可以使四只脚同时着地、放稳。本文指出,当且仅当椅子的四脚共圆时,才能在一般不平的地面上放稳,并对此建立了数学模型,给出了理论上的证明。
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| 关 键 词： | 椅子 不平地面 放稳 充分必要条件 数学模型 |
| 修稿时间： | 1998-07-20 |
The Sufficient and Necessary Condition to Make a Chair Steady on Uneven Ground |
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| Zhao Yanhui. The Sufficient and Necessary Condition to Make a Chair Steady on Uneven Ground[J]. Mathematics in Practice and Theory, 1999, 29(3): 62-65 |
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| Authors: | Zhao Yanhui |
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| Affiliation: | Zhao Yanhui;(Xi |
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| Abstract: | Under normal conditions, it is impossible to make a chair Steady on uneven ground. In this paper, a mathematical model on this question is established, and it is proved that a sufficient and necessaryconditon to make the chair Steady on uneven ground is four feet of the chair is on the common circle. |
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| Keywords: | Chair Uneven Ground Stendy Sufficient and Necessary Condition Mathematical Model |
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