共查询到20条相似文献，搜索用时 46 毫秒
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陈丽 《新乡师范高等专科学校学报》2005,19(5):62-63
从微分中值定理的结果出发并利用几何直观两种方法,研究了构造辅助函数的方法及其微分中值定理的证明,思想方法和微分中值定理简单的运用。 相似文献
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根据数学教学实践，从微分中值定理的条件及宽松的应用环境，定理的实用性，定理证明方法的数学思想三个方面探讨了微分中值定理的教学功能，提出了做好微分中值定理授课应注意的环节和方法． 相似文献
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利用微分中值定理和泰勒公式研究微分中值定理中值点的渐近性质,给出了一元函数Cauchy中值定理以及二元函数微分中值定理中值点渐近性的新的充分条件,推广并完善了最近的一些结果. 相似文献
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改变了教材上微分中值定理的呈现顺序,引导学生通过猜想得到柯西中值定理,再推导出拉格朗El中值定理和罗尔中值定理,启发学生构造合适的辅助函数证明微分中值定理。此外,还探讨了微分中值定理的多元化教学。 相似文献
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李元中 《甘肃广播电视大学学报》1997,(4):46-47
微分中值定理是数学分析中的重要定理。通常在教材中讲述的有拉格朗日定理、柯西中值定理、泰勒公式等。其实，除了这些定理之外，还有许多微分中值命题。通常对于这些微分中值定理的证明，都是各自采用不同方法证明的。我们在[1]中给出了一种统一证法。只要按照一种固定的程式，就可以使一类微分中值命题，得到机械的证明，无需分别寻找特殊的技巧。这种机械的证法除了可以证明现有的命题外，还可以使人们从中得到启示，从而构造出新的微分中值定理。 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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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