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“化归方法”是把未解决的问题，通过某种转化，归结到所解决的问题中去。化归方法主要原则熟悉化原则、简单化原则、具体化原则、极端化原则、和谐化原则。 相似文献
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苏永春 《课程教材教学研究(小教研究)》2013,(2):23-24
化归思想是数学中常用的一种重要思想,一般是指人们将待解决或难以解决的问题通过某种转化过程,归结到一类已经解决或比较容易解决的问题中去,最终求得原问题的解决的一种手段和方法.其本质就是转化.应用化归思想时要遵循三个基本原则:熟悉化原则,即将陌生的问题转化为熟悉的问题;简单化原则,即将复杂的问题转化为简单的问题;直观化原则,即将抽象问题转化为具体问题.其中化归方法是实现化归的关键.化归思想和方法在中学数学解 相似文献
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陈红莲 《中国校外教育(理论)》2011,(9):135-135
在初中数学教学中渗透化归思想和方法是对学生实施创新教育、培养创新思维的重要保证。本文从化归思想的概念、功能以及初中数学中化归的基本形式、化归的特点等内容出发,阐述在应用化归思想方法变更问题时应遵循的基本原则。 相似文献
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1 什么是化归方法从字面上看 ,所谓“化归” ,可以理解为转化和归结的意思 .数学方法论中所论及的“化归方法” ,是指数学家们把待解决或未解决的问题 ,通过某种转化过程 ,归结到一类已经能解决或者比较容易解决的问题中去 ,最终求得原问题的解答的一种手段和方法 .化归方法也称为化归原则 .化归方法的一般模式可图示如下 : 待解决或未解决的问题转化 问题 ( ) 再转化直至归结为已经解决的或比较容易解决的问题 ( ) 解 答 解答 ( ) 解答 ( )从其基本思想而言 ,容易看出 ,化归原则… 相似文献
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陈红莲 《中国校外教育(理论)》2011,(11):52-52
化归思想是初中数学中最基本的数学思想,是初中数学新课标中基础知识的重要组成部分,在初中数学教学中渗透化归思想和方法是对学生实施创新教育、培养创新思维的重要保证。化归思想方法是用一种联系、发展、运动与变化的观点去认识问题的方法。从化归思想的概念、功能,以及初中数学中化归的基本形式、化归的特点等内容出发,简单阐述在应用化归思想方法变更问题时应遵循的基本原则。 相似文献
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利用化归方法的原则指导解题魏海仪（甘肃省兰州市三中７３００３０）化归方法指的是：在解决问题的过程中,不是对问题进行直接的攻击,而是对其进行变形、转化,直至最终把它化归为某个（些）已经解决的问题,或者较为简单的问题．化归方法在数学中具有十分重要的作用．... 相似文献
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《中学生数理化(高中版)》2011,(5)
所谓转化与化归思想,是指通过一系列的转化与化归,把待解决的问题转化为在已有范围内可解的问题的一种思维方式.应用转化与化归思想解题的原则是化难为易、化生为熟、化繁为简.转化与化归思想是数学中最基本的思想方法,数学中一切问 相似文献
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陈建新 《中学生数理化(高中版)》2011,(5):5-5
所谓转化与化归思想,是指通过一系列的转化与化归,把待解决的问题转化为在已有范围内可解的问题的一种思维方式.应用转化与化归思想解题的原则是化难为易、化生为熟、化繁为简.转化与化归思想是数学中最基本的思想方法,数学中一切问 相似文献
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<正>转化与化归是一种重要的数学思想,在解决数学问题以及数学概念学习的过程中起着至关重要的作用。转化与化归思想旨在以数学的方式对问题进行转化,将问题划归为简单、直观、熟悉并且和谐的数学表达形式,从而方便学生深入理解问题并迅速解决。下面首先对转化与化归思想的原则进行探析,之后详细分析应用该思想解决问题的方法和实践策略。1切中肯綮,探析转化与化归的原则转化与化归的具体过程和呈现形式各不相同,但是归根结底都是寻求一种将待解决的问题转化为一种已经具备完善解决方法的问题。 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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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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《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
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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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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献