共查询到20条相似文献，搜索用时 78 毫秒
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复平面的建立实现了几何与复数问题问的转化，因此，可以利用复数法巧解一些几何问题，而复数及其运算的几何意义常是解决这类问题的有力工具． 相似文献
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几何不等式的证明有各种不同的方法．某些问题用几何方法去解是方便的,另一些问题利用代数方法（利用代数不等式和三角函数）是方便的，有时应用向量不等式或利用导数能得到简单的解．证法的多样化甚至使能力强的学生也走头无路.如何着手解题，从何处开始，运用数学课程中的哪些基本知识呢？几何不等式的证明也和其它几何问题一样，应该从作图开始——将题目条件中所指出的元素画在图上，并试图看到它们之间的联系，但是并不总是能得到直接的几何证明．因此需要向学生介绍其它的证明方法．首先要教学生众所周知的公式和图形元素之间的各种关… 相似文献
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王金萍 《数理化学习(初中版)》2003,(5):19-20
用代数知识解几何题.可使一些几何问题的解法简单明了,它充分运用数形结合的数学思想方法,有利于培养学生解综合题的能力. 一、利用方程(组)解几何计算题利用平面几何有关定理、性质把图形中有关边角用代数方法表示,通过代数运算,解决几何有关问题. 相似文献
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杨利群 《成都教育学院学报》2000,14(3):57-59
复数是解决数学问题的主要工具之一，由于复数具有良好的运算性质与明晰的几何意义，因此一些代数与几何问题利用复数来处理较易得到解决。下面我从几何证明与解轨迹题两个方面来具体探讨复数的应用。 相似文献
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一些代数问题用代数方法解很麻烦,甚至无从下手,而根据问题的特征及明显的几何意义,巧妙地构造恰当的几何图形,用几何知识去解决,却显得清晰、直观、明快,起到出奇制胜之效． 相似文献
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利用不等式解几何中的最值问题卢海运（山东省济宁实验中学２７２１２３）几何中的最值问题，大多是通过建立适当的坐标系，把几何问题转化成代数问题或三角问题来求解，这里我们介绍的是怎样用不等式来解几何中的最值问题．例１Ｐ为△ＡＢＣ内一点，Ｄ、Ｅ、Ｆ分别为Ｐ到... 相似文献
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周华生 《河北理科教学研究》2005,(4):20-23
向量集数形于一身，沟通了代数、几何、三角等知识，用它研究问题时可实现形象思维与抽象思维的有机结合，为解几何题提供了一个强有力的工具．本文介绍它在解几何竞赛题中的一些方法和技巧，供参考． 相似文献
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在解一些复杂代数题目时,若能利用题目条件构造一些几何图形,应用数形结合,把代数问题转化为几何问题．常能巧妙求解,化难为易,现举例说明． 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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《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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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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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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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
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献