【金版教程】2015-2016高中数学1.1.3.2补集及集合运算的综合应用随堂练习新人教A版必修11.[2014·浙江高考]设全集U={x∈N|x≥2},集合A={x∈N|x2≥5},则∁UA=()A.∅B.{2}C.{5}D.{2,5}[解析]∵A={x∈N|x≥}={x∈N|x≥3},∴∁UA={x∈N|2≤x<3}={2},故选B.[答案]B2.已知全集U={0,1,2},且∁UA={2},则集合A的真子集共有()A.3个B.4个C.5个D.6个[解析]∵U={0,1,2},且∁UA={2},∴A={0,1}.∴A的真子集是{0},{1},∅共3个,故选A.[答案]A3.设全集U=R,集合X={x|x≥0},Y={y|y≥1},则∁UY与∁UX包含关系(∁UX)________(∁UY).[解析]∵X={x|x≥0},Y={y|y≥1},∴∁UX={x|x<0},∁UY={y|y<1}.∴(∁UX)(∁UY).[答案]4.[2015·江西三校联考]已知集合U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},则(∁UA)∪(∁UB)=________.[解析]∵∁UA={1,3,6},∁UB={1,2,6,7},∴(∁UA)∪(∁UB)={1,2,3,6,7}.[答案]{1,2,3,6,7}5.[2014·湖北襄阳四校高一期中]已知全集U={x|x≤10,x∈N},A={0,2,4,6,8},B={x|x∈U,x<5}.(1)求M={x|x∈A且x∉B};(2)求(∁UA)∩(∁UB).[解]由题意得全集U={0,1,2,3,4,5,6,7,8,9,10},B={x|x∈U,x<5}={0,1,2,3,4},(1)M={x|x∈A且x∉B}={6,8}.(2)∵∁UA={1,3,5,7,9,10},∁UB={5,6,7,8,9,10},∴(∁UA)∩(∁UB)={5,7,9,10}.1