1、第一章1.21.2.2第2课时一、选择题1(2016山东文)设集合U1,2,3,4,5,6,A1,3,5,b3,4,5,则U(AB)() A2,6B3,6C1,3,4,5D1,2,4,6答案A解析AB1,3,4,5,U(AB)2,62(20142015学年度宁夏银川一中高一上学期期中测试)如果U1,2,3,4,5,M1,2,3,N2,3,5,那么(UM)N() 导学号62240147A B1,3C1 D5答案D解析UM4,5,(UM)N53(2015安徽文,2)设全集U1,2,3,4,5,6,A1,2,B2,3,4,则A(UB)() 导学号62240148A1,2,5,6 B1C2 D1,2,
2、3,4答案B解析UB1,5,6,A1,2,A(UB)1,选B4若全集U0,1,2,3,且UA1,2,则集合A的真子集共有() 导学号62240149A3个B5个C7个D8个答案A解析UA1,2,A0,3,集合A的真子集有,0,3,共3个5(2014江西文,2)设全集为R,集合Ax|x290,Bx|1x5,则A(RB)() 导学号62240150A(3,0) B(3,1)C(3,1 D(3,3)答案C解析Ax|x290x|3x5,A(RB)x|3x5x|3x1,故选C6设全集UxN*|x6,集合A1,3,B3,5,则U(AB)()导学号62240151A1,4 B1,5 C2,4 D2,4答案C
3、解析本题考查了集合间的运算A1,3,B3,5,AB1,3,5,又UxN*|x61,2,3,4,5,U(AB)2,4二、填空题7已知集合A0,2,4,6,UA1,1,3,3,UB1,0,2,则集合B_.导学号62240152答案1,4,6,3,3解析UA1,1,3,3,U1,1,0,2,4,6,3,3,又UB1,0,2,B1,4,6,3,38(20142015学年度山西太原市高一上学期期中测试)已知全集U1,2,3,4,5,6,UA1,3,6,则集合A_.导学号62240153答案2,4,5解析U1,2,3,4,5,6,UA1,3,6,A2,4,5三、解答题9设全集UR,集合Ax|1x2,集合B
4、x|1x3,求AB,AB,U(AB),U(AB)导学号62240154解析集合A、B在数轴上表示如图所示ABx|1x2x|1x3x|1x2;ABx|1x2x|1x3x|1x3;U(AB)x|x1或x2;U(AB)x|x1或x310已知全集U1,2,3,4,5,Ax|x25xm0,Bx|x2nx120,且(UA)B1,3,4,5,求mn的值导学号62240155解析U1,2,3,4,5,(UA)B1,3,4,5,2A,又Ax|x25xm0,2是关于x的方程x25xm0的一个根,410m0,m6且A2,3,UA1,4,5,而(UA)B1,3,4,5,3B,又Bx|x2nx120,3一定是关于x的方
5、程x2nx120的一个根n7且B3,4,mn1.一、选择题1设集合UxN|0x8,S1,2,4,5,T3,5,7,则S(UT)()导学号62240156A1,2,4 B1,2,3,4,5,7C1,2 D1,2,4,5,6,8答案A解析UxN|0x81,2,3,4,5,6,7,8,S1,2,4,5,T3,5,7UT1,2,4,6,8,S(UT)1,2,42设全集U和集合A、B、P满足AUB,BUP,则A与P的关系是()导学号62240157AAUP BAPCAP DAP答案B解析借助Venn图,如图所示,AP.也可由BUP,则UBU(UP)P.又AUB,AP.3已知全集U3,5,7,A3,|a7
6、|,若UA7,则a的值为() 导学号62240158A2或12 B2或12C12 D2答案A解析由UA7知,7A,故|a7|5,a2或12.4已知集合Ax|xa,Bx|1x2,且A(RB)R,则实数a的取值范围是() 导学号62240159Aa1Ba2答案C解析RBx|x1,或x2,A(RB)R,a2.二、填空题5若全集UR,集合Ax|x1x|x0,则UA_.导学号62241192答案x|0x1解析Ax|x1x|x0,UAx|0x16设全集UR,集合Ax|x1或2x3,Bx|2x4,则(UA)B_.导学号62241193答案x|x2解析由数轴得,(UA)x|1x2或x3,再由数轴得,(UA)Bx|x2三、解答题7(20142015学年度湖北重点中学高一上学期期中测试)已知全集UR,集合Ax|2x5,Bx|1x6,求(UA)(UB)导学号62240160解析UAx|x5,UBx|x6,(UA)(UB)x|x68(20142015学年度四川成都七中高一上学期期中测试)已知集合Ax|3x7,Bx|2x10,Cx|xa导学号62240161(1)求(RA)B;(2)若AC,求实数a的取值范围解析(1)RAx|x3或x7,(RA)Bx|2x3或7x10(2)将集合A、C表示在数轴上,如图所示若AC,则a7.