共查询到20条相似文献，搜索用时 421 毫秒
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周泽文 《南宁师范高等专科学校学报》2010,27(3):1-2
对于高次曲线上的有理点及整点的确定是数学上一个比较难理解的问题。研究并给出曲线E：y^3=x^4＋x上的所有有理点及整点,证明了曲线E：y^3=x^4＋x的两个定理。 相似文献
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我们知道,f′(x0)的几何意义就是曲线y=f(x)在点(x0,f(x0))处的切线的斜率,其切线方程可以表示为y-f(x0)=f′(x0)(x-x0)．近几年来,随着高考对导数知识考查力度的不断加大,关于高次曲线、分式曲线、根式曲线、指数曲线、对数曲线、三角曲线、 相似文献
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给定已知点求曲线的切线方程这类题目在近几年的高考试题中时有出现,在各类课外资料中也成了热点问题.由于导数为新增内容,曲线的函数又多是高次函数、超越函数等,其方程的曲线学生大多不熟悉,因而在认识和解题中常出现偏差和错误.现就几类常见的问题归结如下,以期对学生的学习 相似文献
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我们用图象法解一元高次不等式,形象直观,便于掌握。我在教学中对一元高次不等式的几种常用解法作过对比实验,学生们最欢迎图象法。我们知道:实系数n次多项式 f(x)=a_0x~n+a_1x~(n-1)+…+a_n (a_0≠0) 在(-∞,+∞)内是单值连续函数,它的图象具有下列性质: (1) 图象在(-∞,+∞)内是一条连续不断的曲线; (2) 当a_0>0(<0)时,对x的充分大的正值,曲线上的点总是在x轴的上 相似文献
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多项式曲线拟合振荡现象的抑制 总被引：2，自引：0，他引：2
多项式曲线拟合是解决工程应用问题中曲线拟合最常用的方法。多项式次数较高时 ,拟合曲线在两端点附近出现的振荡现象一定程度上影响了曲线拟合的实际应用。本文介绍的拟合数据端点增权法 ,较好地解决了高次多项式曲线拟合的振荡问题 相似文献
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对于椭圆型界面问题,针对浸入有限元法的离散方程组,基于四类利用界面曲线信息和跳跃条件构造的浸入式插值延拓算子,建立经济的瀑布型多重网格法,数值实验结果表明,基于高次浸入式插值延拓算子的经济的瀑布型多重网格法更具有效性。 相似文献
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公共电网中高次谐波的含量是衡量电力系统电能品质优劣的重要指标.文章分析了高次谐波产生的原因,列举出高次谐波给电力系统、通信系统造成的种种危害,并介绍了高次谐波的监测和抑制方法. 相似文献
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本文介绍了激光测粒原理及高次衍射现象产生的原因,从理论上推导了高次衍射强度的分布公式,分析了高次衍射对激光测粒产生的影响,讨论了获得最大有效信号强度时颗粒在分散相中的最佳体积浓度。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献