共查询到20条相似文献，搜索用时 625 毫秒
1.
教学目标：经历生活数据收集的过程，理解近似数表示的必要性，并在用近似数进行数据表述的过程中培养和发展自己的数感；探索“四舍五入”求近似数的方法，能根据实际情况，灵活求出不同精确值的近似数。 相似文献
2.
3.
在教学"锐角三角函数"一章时,遇到不少涉及近似数的精确度的实际问题.如:75 31/2精确到个位是多少?有教师认为,要精确到个位,31/2取精确到十分位的近似值即可,也就是75 31/2≈75×1.7=127.5≈128.笔者认为,这个计算方法是有问题的.为此,查阅了有关资料,将近似数"精确到哪一位"在此略做解读.近似数的精确度表示近似数与准确数的接近程度.精确度有两种表示形式:一是用精确到哪一位（精确位）表示,一是用保留几个有效数字（有效数字）表示."精确到哪一位"有如下一些具体约定:1.对一个数取近似数,要求精确到某一个数位,我们就将所要求精确到的数位后一位数字"四舍五入"得到近似数.该近似数最后一位数是由"四舍五入"得到的数,最后一位数所在的数位即是精确到的数位. 相似文献
4.
5.
求方程近似解的Newton迭代法构造的序列是单侧逼近精确解的,这给误差分析带来很大的困难.本文提出了构造Newton迭代双侧逼近序列一般方法,精确解介于两个序列之间,这样可通过两个近似解来估计逼近精确解的程度. 相似文献
6.
[预案]
教学目标:经历生活数据收集的过程,理解近似数表示的必要性,并在用近似数进行数据表述的过程中培养和发展自己的数感;探索“四舍五入“求近似数的方法,能根据实际情况,灵活求出不同精确值的近似数.…… 相似文献
7.
《宜宾学院学报》2017,(6):67-73
稀疏子空间聚类是把子空间聚类问题松弛为凸优化问题,但这种凸近似需要满足较强的非相干性条件,且用观测数据本身作为字典进行子空间表示时,观测数据中所含的噪声、缺损、奇异样本等会增加子空间表示的误差.为解决上述问题,提出一种基于?_p范数(0相似文献
8.
9.
Ⅰ型极小值分布样本异常数据的检验 总被引：1，自引：1，他引：0
针对Ⅰ型极小值分布样本的多个异常数据,提出了一种新的检验方法.首先寻找到总体参数的具有较好稳健性的估计量,然后在此基础上构造出检验统计量,进一步求出了该检验统计量精确的概率密度函数和大样本情形下的近似分布.由于检验统计量中的核心统计量——样本分位数,对于异常数据的干扰具有一定的抵抗力,因此利用该方法可以达到有效的检验效果. 相似文献
10.
张培方 《赤峰学院学报(自然科学版)》2013,(4):30-31
本文通过文献综述与实验方法相结合,针对现实数据采集所存在的问题,经过研究提出工业过程控制时序数据的特点是数据量大,重复度高,直接在原始时序数据上作分析不仅效率低,而且不易观察数据的主要特征,而进一步提出时间序列方法的应用现实价值与展望. 相似文献
11.
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
12.
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
13.
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
14.
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. 相似文献
15.
16.
17.
《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
18.
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
19.
陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
20.
YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献