一般说来,低阶行列式的计算要比高阶行列式的 计算要简便,于是我们自然地考虑到用低阶的行列式 来表示高阶的行列式的问题。为此,先引入余子式和 代数余子式的概念。 定义在n阶行列式D=(a中,把元素在的 第i行、第列划去,剩下的元素按原来的相对位置形 成的n-1阶行列式叫做元素的余子式,记作M称 A=(-1)做元素a的代数余子式

定义1n个有顺序的数a1,a2,an所组成的有序数 组 a= (a a2,,) 称为n维向量。数a,a2,…,an叫做向量a的分量,a 称为向量a的第i个分量。若一个向量的分量都为实 数,则称此向量为实向量;若向量的分量为复数, 则称此向量为复向量。本章只讨论实向量。一般我 们用小写黑体字母a,,或带箭头的小写字 母 a表示向量

New Words deadeye: In informal English, dead may mean \precise(ly)\ or accurate(ly)\. Bill was dead shot with rifle. The model plane landed dead in the middle of the square

I C. Wright Mills: The Sociological Imagination l. Peter Berger: Invitation to Sociology TO SOCIOLOGY ll. Using the Sociological EMILE DURKWEIM Imagination and MicroCase SUICIDE Explorit Data to Follow in Durkheim' s footsteps in Understanding Suicide

Background Information Organization of the Text Text New Word Reading Intensive Study Exercise Check-up Assignment

Sntroduction to Sociology I. Socialization A. Its Meaning and Importance B. Feral Children C. Total Institutions and Resocialization -video clip on military resocialization D. Basic Research Findings 1. Human (Biophysical) Development

1问题的提出 例1.某工厂有3种机器M1,M2,M3, 各为m1,m2,m3台.该厂生产P1,P2,P3, P这4种产品.T=(t;)34中的t为生产 P产品一个单位需要机器M的小时数 i=1,2,3;j=1,2,3,4.设4种 品的单位利润率为c1,c2,c3,c4。假定生 产这4种产品所用的机器无先后之分,每周 机器开动不超过60小时,在一周内应如何

Let's play a game Instruction swing the rope I touch your shoulders 9. snatch the ball 2. bend your knees 10. bowl the ball 3 serve the ball 11. throw the ball

沟通( commun i cation)是指人们之间传 达思想情感和交流信息情报的过程

Raw material selection- fruits and Ⅴ egetables L. Bedford, Campden and Chorleywood Food Research Association 1.1 Introduction Fresh fruits and vegetables are utilised in a wide range of chilled products. They may be sold whole, or peeled (for example peeled potatoes and onions)or further prepared(e.g. carrot batons). After washing or further preparation they form ingredients for mixes such as mixed fruit or salad packs or for further