共查询到20条相似文献，搜索用时 578 毫秒
1.
郑锋锋 《中学数学研究(江西师大)》2009,(3):20-22
《数学通报》2008年第5期的文[1]由一道高考解析几何试题引发探究性学习，得到了关于抛物线x^2=2py的结论1、2，关于曲线Ax^2＋By^2=1（AB≠0）的结论3、4、5等五个结论，其中结论1是结论2的特例，结论3、4是结论5的特例．本文对结论2及结论5作进一步探究，先把文[1]的这两个结论抄录如下： 相似文献
2.
在文[1]中,我们给出了几个新的三角有限和公式及应用。本文是对文[1]中的公式(1)的推广及应用作进一步的讨论。 1、两个结论: 结论1:对任意的x,有: 证:利用上述公式(1)及和差角公式,易得结论1. 结论2:对任意给定的x: 〈1〉当m-i≠jn,n×p时 相似文献
3.
利用交叉表、距离正则图的性质及已有结论对k=10,a1=1的距离正则图的交叉数进行了讨论,得到的结论准确地刻画了k=10,a1=1的距离正则图的性质,利用此结论可对k=10,a1=1的距离正则图进行分类. 相似文献
4.
黄道军 《中学数学研究(江西师大)》2003,(11):15-16
在文[1]中,先利用求多元函数的最值的方法,证明了结论"设a1、b1、c1、a2、b2、c2≥0且a1+b2=b1+c2=c1+a2=1,则a1a2+b1b2+c1c2≤1",接着又构造正三角形证明了该结论,并从这个角度将该结论推广到了"结论1设ai、bi≥0(i=1、2、…、n,n≥4)且a1+b1=a2+b2=…=an+bn=1,则 相似文献
5.
利用交叉表、距离正则图的性质及已有结论对k=10,a1=1的距离正则图的交叉数进行了讨论,得到的结论准确地刻画了k=10,a1=1的距离正则图的性质,利用此结论可对k=10,a1=1的距离正则图进行分类。 相似文献
6.
连其秀 《中学数学研究(江西师大)》2022,(3)
1.原有结论呈现文[1]对一道2018年圣彼得堡奥数不等式试题进行探究,得到了如下的一个结论:结论1已知正实数a1,a2,…,an(n≥2)满足a1+a2+…+an=1,m。 相似文献
7.
所谓完形填空题 ,就是给出结论 ,没有给出条件(或条件残缺 ) ,要答题者分析寻找应具备的条件 (属条件探索型 ) ;或给出条件 ,没有给出明确结论 (或结论不唯一 ) ,要答题者探索、组合出结论 (属结论探索型 )的一类新颖填空题 .下面笔者精选出两道典型例题并予以深刻剖析 ,旨在探索题型规律 ,总结解题方法 .同时精选出 30道类题供同学们演练巩固 .图 1例 1 ( 1998年全国高考题 )如图 1,在直四棱柱A1B1C1D1- ABCD中 ,当底面四边形 A BCD满足条件时 ,有 A1C⊥ B1D1(填上你认为正确的一个条件即可 ,不必考虑所有可能的情形 ) .剖析 :当 … 相似文献
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我们在做一些竞赛题目时,经常遇到已知几个条件等式,求一个代数式的值或求证某个结论.这类题,我们可以从条件入手,造出要求结论的模式,从而解题.例1 已知a b c=3,求证(1-a)~3 (1-b)~3 (1-c)~3=3(1-a)(1-b)(1-c)分析:由结论来看:我们第一步要造出1-a,1-b,1-c 第二步再造出结论的左端.证明:∵a b c=3∴(1-a) (1-b)=-(1-c)∴[(1-a) (1-b)]~3=-(1-c)~3 相似文献
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文献[1]由教材中一道习题的结论推广得到等差数列的如下结论:结论若2个等差数列{a_n},{b_n}的前 n 项和分别为 S_n,T_n,且 (S_n)/(T_n)=(an b)/(cn d)(ac≠0),则(a_m)/(b_n)=(a×(2m-1) b)/(c×(2n-1) d).鉴于文献[1]对该结论的证明较为繁琐,笔者在此给出该结论的简捷证明,并对该结论作些许变式探究. 相似文献
11.
张威 《中国教育研究与创新》2006,3(11):145-150
天保房地产开发公司根植于天津滨海新区。依托控股公司带来的资源优势，基于滨海新区列入国家发展战略部署的背景，在近年来取得了迅速的发展。但是随着国家一系列政策的出台，中国的房地产行业面临着一次大的重新洗牌过程，同时企业内部仍然存在着制度缺陷、管理不规范、流程不清晰、人员激励不足等各方面的问题，所以，天保房地产公司在面临着滨海新区良好发展机遇的同时，也面临着很大的挑战。如何在机遇与挑战并存的环境中，认真分析和评估企业的外部环境及内部资源与能力的优劣势，对企业内部的资源与能力进行积累与培养，制定相应的竞争与发展战略，引导企业的健康长远发展具有一定的必要性与迫切性。
本文从竞争战略的角度，综合分析天保房地产开发公司所面临的外部环境和内部条件，研究探讨天保房地产开发公司的发展战略框架，包括战略的指导思想、战略定位、战略目标及相应的实施措施，以期实现天保房地产开发公司的发展愿景和核心价值。 相似文献
12.
The experiment in which a candle is burned inside an inverted vessel partially immersed in water has a history of more than
2,200 years, but even nowadays it is common that students and teachers relate the change in volume of the enclosed air to
its oxygen content. Contrary to what many people think, Lavoisier concluded that any change in volume in this experiment is
negligible; moreover, the explanation relating oxygen consumption in the air with its change in volume is known to be wrong.
In this work we briefly review the history behind the candle experiment and its relationship with some typical erroneous explanations.
One of the key factors behind Lavoisier’s success was the use of experiments carefully designed to test different hypotheses.
Following these steps, we performed several closed volume experiments where the candle wick was replaced by a capillary stainless
steel cylinder supported and heated by a nichrome filament connected to an external power supply. Our recorded experiments
are displayed as web pages, designed with the purpose that the reader can easily visualize and analyze modern versions of
Lavoisier’s experiments. These experiments clearly show an initial phase of complete combustion, followed by a phase of incomplete
combustion with elemental carbon or soot rising to the top of the vessel, and a final phase where the hot artificial wick
only evaporates a white steam of wax that cannot ignite because no oxygen is left in the closed atmosphere. After either a
complete or incomplete combustion of the oxygen, our experiments show that the final gas volume is nearly equal to the initial
air volume. 相似文献
13.
徐振芳 《中学英语之友(高二版)》2008,(Z2)
秦二世时,丞相赵高野心勃勃,日夜盘算着要篡夺皇位。可朝中大臣有多少人能听他摆布,有多少人反对他,他心中没底。于是,他想了一个办法,准备试一试自己的威信,同时也可以摸清敢于反对他的人。 相似文献
14.
Easy Phonics带你学习自然拼读,让你学会字母的发音规律,正确地拼读单词。本期让我们继续来看看、读读、写写重读音节中包含字母a的单词,区分它们读短音short a-/e/,还是长音long a-/ei/。 相似文献
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Easy Phonics栏目带你轻松地学习自然拼读!在读读、听听、拼拼和玩游戏中,你将了解字母的发音规律,并正确地拼读单词。这一期,我们来学习元音字母a的短音(short a)和长音(long a). 相似文献
16.
从前,有一句话,叫做"吃得苦中苦,方为人上人".这句话被认为动机不纯,怎么可以做"人上人"呢?其实,对于"人上人"可以作不同的理解,一种理解是"骑在人民头上,作威作福",这种"人上人"当然不好;但也可以解释为比别人做更多的贡献,吃更多的苦,经过更多的挫折与困难而比一般人更成熟、更坚强,更知道怎么做人.实际上,对这句话应是作后一种理解的,因为这种"人上人"是与"苦中苦"联系在一起的. 相似文献
17.
张昭兵 《南京师范大学文学院学报》2009,(4):37-44
本文从毕飞宇小说中一再出现的镜、钟、影和胡琴的意向入手,考察毕飞宇小说的叙述人称、叙述速度、叙述结构和叙述意图。深入阐释＂我＂与＂他＂的分离与揉合,＂快＂与＂慢＂的交替与演变,＂是＂与＂非＂的分明与模糊,＂语言＂与＂沉默＂的相反而相成。 相似文献
18.
The concept of metacognition refers to one’s knowledge and control of one’s own cognitive system. However, despite being widely
used, this concept is confusing because of several reasons. First, sometimes it is not at all clear what is cognitive and
what is metacognitive. Second, researchers often use the same term, namely, “metacognition” even when they refer to very different
aspects of this complex concept. Alternatively, researchers may use different terms to indicate the same metacognitive elements.
Another foggy matter is the interrelationships among the various components of metacognition discussed in the literature.
This conceptual confusion regarding the concept of metacognition and its sub-components calls for in-depth theoretical and
conceptual clarifications. The goal of this article is to portray a detailed example of a conceptual analysis of meta-strategic
knowledge (MSK) which is one specific component of metacognition. This specific example is used to draw a general model for
conceptual analyses of additional metacognitive components. The approach suggested here is to begin with a clear definition
of the target sub component of metacognition, followed by a systematic examination of this sub component according to several
dimensions that are relevant to metacognition in general and to that sub component in particular. The examination should include
an analysis of how the details of the definition of the target sub-component refer to: (a) general theoretical metacognitive
issues raised by prominent scholars; (b) definitions formulated and issues raised by other researchers who have investigated
the same (or a similar) sub-component and, (c) empirical findings pertaining to that sub-component. Finally, it should be
noted that since metacognition is a relational rather than a definite concept it is important to situate the context within
which the conceptual analysis takes place. 相似文献
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