不等式高考试题分析与教学策略分析

高中数学由众多内容组成,其中不等式是高中数学的重要组成部分.学生对不等式的学习从初中就开始了,掌握了不等式的基本性质和解法,为学生在高中进一步学习不等式知识打下了基础.此外,现实生活中蕴含着丰富的不等式知识,随处可见不等式在生活中的应用.如今,不等式在数学高考中更是占据了重要的位置,同时与函数、方程、三角等高中数学知识联系紧密.分析     

含参数的一元二次不等式的轻松破解

含参数的不等式解法,涉及到分类讨论,于是也就成了学生一遇到就头疼的问题,甚至是恐惧,在后面的利用导数求函数单调区间的问题时,也就变成了部分学生的难题.针对学生在此类问题中出现的问题,笔者做一梳理,对轻松求解含参数的不等式,乃至分类讨论问题进行了思考.一、熟练掌握两类特殊不等式的解法,形成固定套路即会解两类特殊不等式,一类是一元一次不等式,另一类是一元二次不等式.解不等式,从代数角度上看就是利用不等式的性质,找已知不等式的同解不等式的过程,这个过程的主要任务是化简,即化简到一元一次不等式;从几     

推介一组优美的国外代数不等式竞赛题

不等式证明是各级各类数学竞赛的热门话题,在2012年国外的数学竞赛里,出现了许多优美的不等式证明题,笔者收集整理了当中的一部分,作为新颖的竞赛辅导资料必是有益的.对于这些不等式的证明,其关键是恰当的代数变形,以及适时利用均值不等式、柯西不等式.     

体积差的等周不等式

首次提出并建立了凸体的体积差函数的等周不等式,它是经典等周不等式的推广.作为应用,对星体建立了体积差函数的对偶等周不等式和广义对偶等周不等式.     

Lp Brunn-Minkowski型仿射均质积分不等式

经典的仿射均质积分不等式是Brunn-Minkowski理论中一个关键不等式.建立了L_p Brunn-Minkowski型仿射均质积分不等式,定义了L_p Brunn-Minkowski型仿射混合均质积分且推广得到了L_p Brunn-Minkowski型仿射混合均质积分不等式.     

不等式的综合应用(连堂讲稿)

[复习说明]不等式的应用可渗透到高中数学的各个部分,具有应用广泛、变换灵活的特点.不等式内容在历届高考中一直是考查的重点和热点,主要题型有比较实数大小、证明不等式、解不等式和不等式的应用.近几年高考加强了在知识交汇点上命题的力度,单独解不等式或证明不等式的题目有所减少,而频频出现考查不等式综合应用的试题.不等式与函数、方程、三角、数列、复数、解析几何相联系的综合题常以中、高档题型出现,突出体现了数学思想方法和不等式性质的综合应用,以及解决实际问题的能力.本专题复习的重点是均值不等式的综合应用与不等式的同解变…     

几个改进的矩阵不等式（英文）

本文研究了矩阵不等式的问题.利用两个新的标量不等式,得到了矩阵的加权几何均值不等式和Hilbert-Schmidt范数不等式,所得的结果改进了相应的不等式.     

不等式F（x）·（φ（x）)~(1/2)≥0解法探讨

引例解不等式 . 错解原不等式等价于不等式组: 即 解得x≥4, ∴ 原不等式的解集为{x|x≥4}. 剖析显然当x=-1时,原不等式也成立.为什么漏掉x=-1这个解呢?究其原因是忽略了原不等式中的“≥”号具有不等和相等的双重性.要注意:同解定理“不等式F(x) 与不等式组 同解”中的不等号是“>”,而不是“≥”.     

广义Minty 向量似变分不等式解的性质

在拓扑向量空间中讨论下Dini方向导数形式的广义Minty向量似变分不等式问题. 可微形式的Minty变分不等式、Minty似变分不等式和Minty向量变分不等式是其特殊形式. 该文分别讨论了Minty向量似变分不等式的解与径向递减函数, 与向量优化问题的最优解或有效解之间的关系问题, 以及Minty向量似变分不等式的解集的仿射性质. 这些定理推广了文献中Minty变分不等式的一些重要的已知结果.     

一个Hilbert型不等式及其等价形式的加强推广

本文研究了Hilbert型级数不等式.利用改进的Euler-Maclaurin求和公式及权系数的方法,并引进两对共轭指数,获得一个具有最佳常数系数的Hilbert型不等式,该不等式是联系若干Hilbert型不等式的加强推广式.作为应用,给出该不等式的等价形式及若干有意义的特殊结果.     

Components exponential scator holomorphic function

The components exponential scator function, succinctly labeled “cexp,” is a function of scator variable in 1+n dimensional elliptic scator algebra. This function is introduced here, and its elementary properties are studied. In 1+1 dimensions, the cexp function becomes the usual complex exponential function of complex variable. The cexp function is shown to be scator holomorphic in the entire scator set according to the differential quotient criterion. The scator derivative of the cexp function is the cexp function itself. The relationship between the Cartesian and polar forms of the cexp function can be seen as a higher-dimensional extension of Euler formula. The mappings of grids in 1+2 dimensional space exhibit ellipses and Lissajous-like figures in addition to circles and radial lines. A cusphere surface is generated for the isometric condition in the function's image. An interesting application of the cexp function as propagators regarding the quantum measurement problem is outlined.     

具有时间与位置相关的两类平行机排序问题

研究带有维修时间限制的时间和位置效应平行机排序问题,涉及同型机和非同类机两种机器类型.工件的实际加工时间同时受到位置效应和时间效应影响,且机器具有维修限制.目标函数由机器负载,总完工时间与总等待时间组成.非同类机情形下,通过将排序问题转化为指派问题,给出多项式时间算法,其算法的时间复杂度为O（n^k+2/（k-1）!）.同型机情形下通过转化目标函数,使用匹配算法得出排序问题的多项式时间解,其时间复杂度为O（（2n+m+n log n）n^k-1/（k-1）!）.     

代数体函数及其微分多项式

本文证明了v值代表体函数w的微分多项式p(w)是-λ(1<λ相似文献   

Entire Approximations to the Truncated Powers

For a variation diminishing function $g$ which is analytic on a set containing the real line and any real polynomial $P$, we prove that $g+P$ has at most $\text{deg}(P)+2$ real zeros. Based on this estimate, we present a way to construct entire approximations $G_n$ to the truncated powers $x_+^n$ for $n\in{\bf N}_0$. Here $x_+^n=x^n$ for $x>0$ and $x_+^n=0$ for $x<0$. The function $G_n$ is constructed in such a way that \[ G_n(x)-x_+^n=F(x)H_n(x)\] holds, where $F$ is entire and $H_n$ has no zeros on the real line. The function $G_n$ can be viewed as an interpolant of $x_+^n$ with a nodal set that is given by the (real) zeros of $F$. As an application of this method, we give explicit formulas for best $L^1({\bf R})$-approximation and best one-sided $L^1({\bf R})$-approximation from the class of entire functions with given exponential type $\eta$ to $x_+^n$. These approximations are given in terms of the logarithmic derivative of the Euler Gamma function.     

二重福里哀级数系数的性质

<正> §1.引言.设 f(x)为以2π为周期的周期函数,其福里哀展开式为下列各事是大家熟知的:设 f(x)在一个基本区间(0,2π)不有界变差的函数,则     

Lumps and their interaction solutions of a (2+1)-dimensional generalized potential Kadomtsev-Petviashvili equation

A (2+1)-dimensional generalized potential Kadomtsev-Petviashvili (gpKP) equation which possesses a Hirota bilinear form is constructed. The lump waves are derived by using a positive quadratic function solution. By combining an exponential function with a quadratic function, an interaction solution between a lump and a one-kink soliton is obtained. Furthermore, an interaction solution between a lump and a two-kink soliton is presented by mixing two exponential functions with a quadratic function. This type of lump wave just appears to a line $k_2x+k_3y+k_4t+k_5 \sim 0$. We call this kind of lump wave is a special rogue wave. Some visual figures are depicted to explain the propagation phenomena of these interaction solutions.     

Change in the degree of anisotropy of unidirectional glass-reinforced plastics during winding

The change in the degree of anisotropy of the principal elastic and strength properties of unidirectional glass-reinforced plastics during the winding process is described. Two such materials — LSB-F and LSO-R-2M — have been experimentally investigated. The anisotropy of the elastic properties is characterized by the parameter and that of the strength properties by the parameter =/_r.Institute of Polymer Mechanics, Academy of Sciences of the Latvian SSR, Riga. Translated from Mekhanika Polimerov, No. 5, pp. 953–956, September–October, 1970.     

Analytic solutions of a (2 + 1)‐dimensional variable‐coefficient Broer–Kaup system

Based on a Riccati equation and one of its new generalized solitary solutions constructed by the Exp‐function method, new analytic solutions with free parameters and arbitrary functions of a (2 + 1)‐dimensional variable‐coefficient Broer–Kaup system are obtained. These free parameters and arbitrary functions reveal that the (2 + 1)‐dimensional variable‐coefficient Broer–Kaup system has rich spatial structures. As an illustrative example, two new spatial structures are shown by setting the arbitrary functions as different Jacobi elliptic functions. Compared with tanh‐function method and its extensions, the method proposed in this paper is more powerful and it can be applied to other nonlinear evolution equations. Copyright © 2010 John Wiley & Sons, Ltd.     

(2+1)维modified Zakharov-Kuznetsov方程的复合型新解

给出函数变换,变量分离形式解与第一种椭圆方程相结合的方法,构造了(2+1)维modified Zakharov-Kuznetsov(m ZK)方程的多种复合型新解.步骤一,给出两种函数变换,将(2+1)维m ZK方程转化为能够获得变量分离解的非线性发展方程.步骤二,给出非线性发展方程的变量分离形式解,通过第一种椭圆方程及其相关结论,构造了(2+1)维m ZK方程的双孤子解和双周期解等复合型新解.     

一个包含Smarandache原函数的方程

设p为素数,n为任意正整数,我们定义Smarandache原函数S_p(n)为最小正整数k,使得p~n|k!,即S_p(n)=min{k∈N:p~n|k!}．本文利用初等方法研究了方程S_p(1)+S_p(2)+…+S_p(n)=S_p((n(n+1))/2)的可解性,并给出了该方程的所有正整数解．