1、第一单元集合与常用逻辑用语第一节集合的概念及其基本运算一、填空题1. 下列五种表述:01,2,3;0;0,1,21,2,0;0;0.其中错误表述的个数为_2. (2010安徽改编)若Ax|x10,Bx|x30,则AB_.3. 若 x|x2a,aR,则实数a的取值范围是_4. (2010全国改编)设全集U1,2,3,4,5,集合M1,4,N1,3,5,则N(CUM)_.5. (2011南京师大附中期中考试)若集合Ax|x|1,xR,By|yx2,xR,则AB_.6. (2011镇江调研)已知集合A3,m2,B1,3,2m1,若AB,则实数m的值为_7. 集合M3,2a,Na,b,若MN2,则MN
2、_.8. (2011苏南三校调研)已知全集U0,1,3,5,7,9,ACUB1,B3,5,7,那么(CUA)(CUB)_.9. (2011常州调研)已知集合A0,1,Ba2,2a,其中aR,我们把集合x|xx1x2,x1A,x2B记作AB,若集合AB中的最大元素是2a1,则a的取值范围是_二、解答题10. 设集合Ax|x2ax120,Bx|x2bxc0,且AB,AB3,4,AB3,求实数a,b,c的值11. 已知R为实数集,集合Ax|x23x20,若BCRAR,BCRAx|0x1或2x3,求集合B.12. 设全集是实数集R,Ax|2x27x30,Bx|x2a0(1)当a4时,求AB和AB; (2)若(CRA)BB,求实数a的取值范围参考答案10. AB3,3A且3B,将3代入方程x2ax120中得a1,从而A3,4又AB3,4,AB,B3a1,b6,c9.11. Ax|1x2,CRAx|x1或x2又BCRAR,ACRAR,可得AB.而BCRAx|0x1或2x3,x|0x1或2x3B.借助于数轴可得BAx|0x1或2x3x|0x312. (1)A,当a4时,Bx|2x2AB.ABx|2x3(2)CRA,当(CRA)BB时,B CRA.当B,即a0时,满足B CRA;当B,即a0时,Bx|x要使B CRA,则有,解得a0.综上可得,实数a的取值范围是a.