初中数学“只有一个正确的选择支”的常用解法

数学选择题是中考基本题型之一,特别是“只有一个正确的选择支”这一重要信息,应作为我们解答选择题的基本出发点。一般解答选择题的策略是以直接思路肯定为主,间接思路否定为辅,准确、快捷、精巧是解选择题的基本要求：要在巧字上做文章,配合使用多种解题方法,尽量避免“小题大做”。即第一,熟练掌握各种基本题型的一般解法;第二,结合中考“只有一个正确的选择支”的结构（由“四选一”的指令、题干和选择项所构成）和不要求书写解题过程的特点,灵活运用直接法、排除法、图解法等选择题的常用解法与技巧;第三,挖掘题目“个性”,寻求简便解法,充分利用选择支的暗示作用,迅速地作出正确的选择。我现就其常用解法举例如下。     

高等数学单选题的解法

高等数学历来是考生感到困难的课程之一，高数试题中单项选择题是常见的类型，且所占的分量很重，解答好单选题是取得合格成绩的关键；单项选择题的信息量大，各选项又似是而非，要做好单选题，避免落入“诱误”作用的圈套，先决条件是准确理解有关基本概念。这里介绍几种常用的解答单选题的方法，供自学考生参考。１．直接法直接法是一种最普通常用的解单选题的方法，一般是直接从题设条件出发，运用所学的数学概念、法则和定理，进行正确的推理和运算，得出正确答案。一般用于考查计算能力为目的的选择题。例１limx→∞（１－２x）x＋２＝…     

发掘高考数学试题中隐含信息的解题功能

1 用诱功能 所谓用诱功能,是针对选择题而言的,因为一个好的选择题,其选择支必须反映了命题者对学生解答过程中的一些可能错误的估计,而学生的错误常常只是因为某一方面的理解有缺陷.认真分析题目中隐含的诱误信息,充分利用答案中的诱误设计,快速判断,有助于大大提高解题的准确性.     

高考物理选择题求解“16法”

选择题不同于计算题,追求的是结果,无需详尽的解答,考点辐射广,信息量大,针对性强,具有一定的猜测性,评卷客观、公正,对“理解、推理、分析综合、应用数学解决物理问题及实验能力”的考查,有很好的检测作用,是高考的重头戏．解选择题,一要“阅读”的速度;二要“三审”：审题干、审选项、审题干和选项的关系;三要掌握如下方法和技巧：     

怎样解选择题

选择题是各种考试中常见的题型之一,它是由已知条件(题干)和供选择的结论(选择支)两部分组成.选择题的特点是选择支含有诱误支,这些诱误支是根据运用概念、推理和计算时出现的常见错误设计的,有较大的迷惑性.我们解题时应予以注意.选择题的另一特点是,问题的结论已在选择支中给出,又不要写出解题过程,因此,它既不同于解答题,又不同于证明题,学就使得选择题有一些独特的解法.下面谈谈解一元(选择支中有且仅有一个是正确的)选择题的常用方法:     

选择题难度系数与猜测因素的微型研究

1．问题的提出 由于选择题具有全面考查“双基”、广泛覆盖知识点等多种功能：并且回答方便、评分客观、利于机器阅卷，因而被考试（特别是大型考试）所广泛使用．但是，在考试命题的实践中我们一再看到，选择题的难度预测比填空题、解答题都难把握（有时甚至连一道选择题都没有估对）．因此，我们想从选择题的源头、也就是题型结构入手，对影响选择题难度系数与猜测因素作些微型研究，这是本文的一个基本诱因．     

高考数学选择题解法技巧例析

选择题在高考试卷中占分比例高,具有概括性强、知识覆盖面广、小巧灵活,且有一定的综合性和深度等特点．在解答选择题时应突出一个“选”字,充分利用题干和选择支两方面提供的信息,依据题目的具体特点,灵活、巧妙、快速地选择解法,以便快速智取．解答选择题的常用方法有：直接法、排除法（也称筛选法,淘汰法）、验证法、分析法、特例法、估算法、图解法．     

怎样解高考数学选择题

选择题是高考数学试卷三类题型中题量最多,又较容易得分的一类题型.由于高考数学选择题都是单选题(有且只有一个正确的选择支),因而解高考数学选择题的关键在于“找”出这个正确选择支,而不拘泥于用哪种解法.充分利用题干和选择支两方面所提供的信息迅速作出判断,是解高考数学选择题的基本思路;“熟、准、快”(即熟练、准确、快捷)是解高考数学选择题的基本要求;在“巧做”上做文章,则是解高考数学选择题的基本策略.本文着重介绍解高考数学选择题的基本技巧和策略.解高考数学选择题的常用方法有:1.直接法;2.逆推验证法;3.特殊化法;4.特征分…     

巧用9大"特色"运算 速解高考数学选择题

高考中的数学选择题一般是容易题或中档题,个别题属于较难题,当中的大多数题的解答可用特殊的方法快速选择．解选择题的基本思想是既要看到各类常规题的解题思想,但更应看到选择题的特殊性,数学选择题的4个选择支中有且仅有1个是正确的,因而,在解答时应该突出一个“选”字,尽量减少书写解题过程,要充分利用题干和选择支两方面提供的信息,     

三角函数、平面向量题型专题

方法指导1．三角函数与平面向量选择题主要考查基础知识的理解、基本技能的熟练、基本计算的准确、基本方法的运用、考虑问题的严谨、解题速度的快捷等方面．选择题的题干与正确选项确定后,其它的选择支实质为干扰项,它们既有诱误性,又有针对性     

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,     

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.     

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.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.