共查询到20条相似文献，搜索用时 62 毫秒
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曹枫林 《襄樊职业技术学院学报》2012,11(4):31-32
求二阶变系数线性微分方程的解,迄今为止没有一种成规的方法。本文对二阶变系数线性微分方程进行研究,从方程的自身特点出发,构造辅助函数;给出可化为常系数或可降阶的变系数二阶微分方程的条件,及在此条件下求变系数微分方程的解。 相似文献
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二阶线性齐次微分方程在微分方程理论中占有重要位置,但二阶变系数线性微分方程却没有一般的求解方法,给出了几种通过变量变换将二阶变系数线性微分方程化为二阶常系数的线性微分方程的充分条件. 相似文献
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关于二阶变系数线性微分方程的求解方法 总被引：2，自引：0，他引：2
若知道二阶变系数齐次线性微分方程的一个非零特解,则可以求出它的通解。同时也能推导出相应的二阶变系数非齐次线性微分方程的通解。并且本文也给出了一些求二阶变系数齐次线性微分方程非零特解的构造方法。 相似文献
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先提出引理,即某函数是二阶变系数线性齐次微分方程的解的充要条件,再给出在已 知二阶变系数线性齐次微分方程的某一解的条件下,二阶变系数线性非刘次微分方程的通解公式－即定理１, 相似文献
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二阶变系数线性微分方程的特解 总被引：1，自引：0，他引：1
在已知二阶变系数齐次微分方程的一个非零特解的条件下,可以得到该齐次微分方程和与它对应的非齐次微分方程的通解,本文给出了在二阶变系数齐次微分方程的系数满足一定条件下的特解形式. 相似文献
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石正华 《南昌教育学院学报》2012,(1):69+78
在科学研究、工程技术中,常常需要将某些实际问题转化为二阶变系数线性微分方程。然而,对此类方程的一般形式,目前还尚未有通用的求解方法,但一些特殊类型是可以求解的。那么,对特殊的二阶变系数齐次微分方程又应该如何求解呢?这便是本文所要讨论的内容。本文主要利用构造法与常数变易法来求解二阶变系数齐次微分方程,希望能给读者一些启发与帮助。在实际问题中,二阶变系数齐次微分方程有着广泛的应用。本文给出了一类特殊二阶变系数齐次微分方程的求解方法。 相似文献
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贡韶红 《彭城职业大学学报》2003,18(5):58-60
通过降阶给出求常系数二阶线性微分方程通解的一般公式，即可通过不定积分直接求微分方程通解，并将这种方法进一步推广到阶线性常系数微分方程的求解上。 相似文献
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给出了二阶线性微分方程求通解的一般公式，并对几类变系数的二阶线性齐次微分方程化为常系数的微分方程作了详细的讨论。 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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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
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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
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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