2018_2019学年高中数学第一章集合与函数概念1.1.3集合的基本运算(全集与补集)课件新人教A版必修1.ppt

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补集与全集,1.1.3集合的基本运算,观察集合A,B,C与D的关系:,A=菱形,B=矩形,C=平行四边形,D=四边形.,思考,在研究集合与集合的关系时,如果一些集合是某个给定集合,的子集,则称这个集合为全集.,全集常用U表示.,定义,设U是全集, A是U的一个子集,则由U中所有不属于A的元素组,成的集合叫作U中子集A的补集,记作,即,定义,CUA,CUA,U,A,用Venn图表示如下:,CUA,(1),(2),U,性质,(CUA)=,(CUB)=,例1 设全集为R,求:,例题讲解,(CRA) (CRB),CRA,CRB,(CRA) (CRB),C,C,例题讲解,例2 设U=xx是小于9的整数,A=1,2,3,B=3,4,5,6,求 , .,解:根据题意可知,1,2,3,4,5,6,7,8 所以 = 4,5,6,7,8, =1,2,7,8, .,设全集为U=,求实数a的值.,练习,=,=,小结,C,C,

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