3、},M={3,4,5,7},N={2,4,5,6},贝ij()A.MQN={4,6}B.MUN=UC.D.QuM)CN=N5.已知全集(/={1,2,3,4,5},集合A={xlr2-3x+2=0},B={xx=2afa^A],则集合UB)中元索个数为()A.1B.2C・3D・46.已知全集U=AUB中有加个元素,中有几个元素.若AQB非空,则AQB的元素个数为()A.mnB.m+nC.n~mD.m~n7・设集合(7={1,2,3,4,5},A={2,4},B={3,4,5},C={3,4},则(AUB)Q(4C)=.8・已知全集t/=
4、{2,3,a2-a-l],A={2,3},若[皿={1},则实数o的值是.9.设集合A={xx+m^0}fB={x-25、},求AQB,(bB)UP,(AQB)Q(M).11.已知集合A={;d/+ax+12b=0}和3={兀1?—d+b=0},满足3门([泌)={2},AA(C皿)={4},t/=R,求实数a,b的值.12.已知集合A=[x2a-26、x<2},且A=[RB,求实数a的取值范围.课后作业一、选择题(每小题5分,共20分)1.已知全集U={1,2,3,4,567,8},M={1,3,5,7},N={5,6,7},贝lJ(u(MUN)=()A.{5,7}B.{2,4}C.{2,4,8}D.{1,3,5,6,7}2.已知U={xl—1WxW3},A={xl_lVxV3},B={xlx2-2x-3=0),C={xl_lWx<3},则下列关系正确的是()A.〔uA=BB・Cl,B=CC・(CuB)nCD.A:C4.已知U=R,A={xlx>0},B={xlxW—l},贝lj(An
7、CtlB)U(BnCuA)=()A.0B.{xlxWO}C.{xlx>-l}D.{xlx>0或xW—l}5・设集合A={4,5,7,9},B={3,4,7,8,9},全集U=AUB,则集合〔u(AQB)屮的元素共有()A.3个B.4个C.5个D.6个6.已知全集U=R,则正确表示集合M={—1,0,1}和N={xlx2+x=0}关系的韦恩(Venn)图是()二、填空题(每小题5分,共10分)1.设全集U=AUB={xllWxvlO,xEN+},若APl(CuB)={mlm=2n+l,n=0,l,2,3,4},则集合B=.2.已知人=仪仪0
8、1或x>3),B={xlx>2},贝lJ([RA)UB=3.己知全集11=“集合A={xl—2WxW3},B={xlxv—1或x>4},那么集合AQ£」B)等于三、解答题(每小题10分,共20分)4.设全集为R,A={xl3Wxv7},B={xl2vxvl0},求[r(AUB)及([rA)QB.5.集合A={xlxW_2或x23},B={xlavxvb},若AC1B=0,AUB=R,求实数a,b.6.(10分)已知U=R,A={xlx2+px+12=0},B={xlx2-5x+q=0},若(SA)QB={2},(CLIB)AA=4,求AU
9、B.13・设集合A={xl—5WxW3},B={xlxv—2或x>4},求AQB,(CrA)U([rB).