关于单调函数生成的复合函数的单调性

本文根据复合函数满足结合律，得到了由有限个单调函数生成的复合函数的单调性，若中间函数有奇数个单调减少函数，则复合所得的函数是单调减少函数，若中间函数有偶数人单调减少函数，则复合所得的函数是单调增加函数。     

对函数方程的吹毛求疵

函数方程相关的函数问题,一直是函数知识中较难的学习内容,尤其更以函数方程确定的抽象函数为甚． 定义：含有未知函数的等式称为函数方程．解函数方程的问题,就是求能使函数方程成立的一个函数或一类函数的集合．     

浅谈高考对分段函数的考查

有些函数在其定义域的不同部分用不同的解析式来表达，这类函数称为分段函数．分段函数是一个函数，不要把它误认为是几个函数．分段函数是一种较复杂的函数，只是在定义域的不同部分对应法则不同而已．分段函数不同于复合函数，也不同于由函数的四则运算产生的函数．通过分段函数，一次可以考查多个函数的性质，因此分段函数问题备受高考命题者的...     

用初等方法讨论函数

用初等方法对函数进行讨论,就是把自变量变动时函数的变化过程揭示出来.讨论的内容一般是:求出函数的定义域;求出函数的零点;函数的极值、最值;函数在哪些区间是正的,哪些区间是负的;函数的有界性;函数的单调性;函数的奇偶性;函数的周期性;函数的连续性;绘制函数的图象等等.     

浅析EXCEL中IF条件函数的应用

随着计算机的日益普及,Excel电子表格软件已经成为我们日常办公必备软件之一。Excel函数共有11类,分别是数据库函数、日期与时间函数、工程函数、财务函数、信息函数、逻辑函数、查询和引用函数、数学和三角函数、统计函数、文本和数据函数以及外部函数。在Excel的逻辑函数中,有三大条件函数分别是IF函数、COUNTIF函数、SUMIF函数。在实际工作中,根据学生成绩表的数据,利用上述IF条件函数完成对学生成绩等级、等级人数和等级平均分的计算．简化了大量的统计工作．提高了办公效率。     

函数复习中的三点深化

函数是高中数学中的重要内容 ,它贯穿于高中数学始终 .函数的性质种类繁多 ,要想真正掌握好函数的性质 ,必须牢牢抓住函数的核心 ,函数的核心是 :关系、图象、定义域 .只有抓住了这函数的三宝 ,才能真正学好函数 .1　函数关系式函数关系式是函数的核心 ,我们可以通过它研究函数的性质 ,从而对函数有一个准确、全面的了解 ,所以学习函数首先要掌握函数关系式 .而函数关系式有时候要我们自己去挖掘出来 ,因此 ,在学习函数时还必须掌握下列问题 .1.1　探求关系式在给定的条件下探求函数的解析式是函数学习中的一种重要题型 ,它形式多样 ,综合性…     

《经济应用数学基础》期末复习辅导

一元微积分 一、主要概念及重要结论: 1.理解函数的定义;掌握函数定义域的求法及函数奇偶性的判别法;会判别两个函数是否相同。牢记六个基本初等函数。知道初等函数、复合函数定义。分段函数不是初等函数。     

函数与其导函数的函数特性的关系

函数的特性是研究函数和应用函数解决问题的基础,函数的导函数又与其有密切的关系.本文探讨了函数与其导函数特性的关系.     

生产函数与成本函数的对偶关系及其特征

生产函数与成本函数是生产过程中密切相关又相互对应的两个函数.本文给出短期生产函数与短期成本函数、长期生产函数与长期成本函数的对偶关系,并指明具有对偶关系的生产函数与成本函数的两个重要特征.     

两类重要的经济函数

经济类学员对于函数并不陌生,而对于经济函数却生疏得很,故而在电视播出第三讲《经济中常用的函数》一节课介绍了总成本函数、价格函数、需求函数、供应函数、收益函数、利润函数、平均成本函数、库存函数、其他经济函数等九个函数,就有点应接不暇而无所适从了,有的学员甚至因此对经济数学丧失信心。实际上,我们将它们     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

Western and Eastern culture differences in commercial field

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.     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

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?     

只要努力,不要后悔

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.     

浅谈移民问题

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.     

风的曲线

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.     

团图为数的图中的闭团贯数

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.     

Sister Carrie, an Adherent of Desires

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.