第一章 第一节 集合
- 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。
第一章集合与常用逻辑用语
第一节集合
课时规范练
A组基础对点练
1.(2018·高考全国卷Ⅰ)已知集合A={0,2},B={-2,-1,0,1,2},则A∩B =() A.{0,2}B.{1,2}
C.{0} D.{-2,-1,0,1,2}
解析:A∩B={0,2}∩{-2,-1,0,1,2}={0,2}.
故选A.
答案:A
2.(2018·高考全国卷Ⅲ)已知集合A={x|x-1≥0},B={0,1,2},则A∩B=() A.{0}B.{1}C.{1,2}D.{0,1,2}
解析:∵A={x|x-1≥0}={x|x≥1},∴A∩B={1,2}.
故选C.
答案:C
3.(2018·高考天津卷)设集合A={1,2,3,4},B={-1,0,2,3},C={x∈R|-1≤x<2},则(A∪B)∩C=() A.{-1,1}B.{0,1}
C.{-1,0,1} D.{2,3,4}
解析:∵A={1,2,3,4},B={-1,0,2,3},
∴A∪B={-1,0,1,2,3,4}.
又C={x∈R|-1≤x<2},
∴(A∪B)∩C={-1,0,1}.
故选C.
答案:C
4.若集合M={x||x|≤1},N={y|y=x2,|x|≤1},则()
A .M =N
B .M ⊆N
C .M ∩N =∅
D .N ⊆M 解析:因为M ={x ||x |≤1},所以M ={x |-1≤x ≤1},因为N ={y |y =x 2,|x |≤1},所以N ={y |0≤y ≤1},所以N ⊆M ,故选D .
答案:D
5.(2019·日照3月联考)已知集合
M =⎩⎨⎧⎭⎬⎫x ⎪⎪⎪x 216+y 29=1,N =⎩⎨⎧⎭⎬⎫y ⎪⎪⎪x 4+y 3=1,则M ∩N =
( )
A .∅
B .{(4,0),(3,0)}
C . [-3,3]
D .[-4,4] 解析:由题意可得M ={x |-4≤x ≤4},N ={y |y ∈R },所以M ∩N =[-4,4].故选D .
答案:D
6.设集合A ={1,2,6},B ={2,4},C ={1,2,3,4},则(A ∪B )∩C =( )
A .{2}
B .{1,2,4}
C .{1,2,4,6}
D .{1,2,3,4,6} 解析:由题意知A ∪B ={1,2,4,6},
∴(A ∪B )∩C ={1,2,4}.
答案:B
7.设集合A ={x |-2≤x ≤2},Z 为整数集,则集合A ∩Z 中元素的个数是( )
A .3
B .4
C .5
D .6 解析:由集合A ={x |-2≤x ≤2},易知A ∩Z ={-2,-1,0,1,2},故选
C .
答案:C
8.已知集合A ={-1,2,3,6},B ={x |-2<x <3},则A ∩B =________. 答案:{-1,2}
9.已知集合U ={1,2,3,4},A ={1,3},B ={1,3,4},则A ∪(∁U B )=________.
解析:∁U B ={2},∴A ∪∁U B ={1,2,3}. 答案:{1,2,3}
B 组 能力提升练
10.已知全集U ={0,1,2,3},∁U M ={2},则集合M =
( )
A .{1,3}
B .{0,1,3}
C .{0,3}
D .{2}
解析:M ={0,1,3}. 答案:B 11.已知集合A ={0,1,2},B ={1,m }.若A ∩B =B ,则实数m 的值是( )
A .0
B .2
C .0或2
D .0或1或2
解析:∵A ∩B =B ,∴B ⊆A ,∴m =0或m =2. 答案:C
12.设全集U =R ,集合
A =⎩⎪⎨⎪⎧⎭⎪⎬⎪⎫x ∈R ⎪⎪⎪x -1x -2>0,
B ={x ∈R|0<x <2},则(∁U A )∩B =
( )
A .(1,2]
B .[1,2)
C .(1,2)
D .[1,2]
解析:依题意得∁U A ={x |1≤x ≤2},(∁U A )∩B ={x |1≤x <2}=[1,2),选B . 答案:B
13.(2019·惠州模拟)已知集合A ={0,1},B ={z |z =x +y ,x ∈A ,y ∈A },则集合B 的子集的个数为
( )
A .3
B .4
C .7
D .8
解析:由题意知,B ={0,1,2},则集合B 的子集的个数为23=8.故选D . 答案:D
14.设集合A ={3,m },B ={3m ,3},且A =B ,则实数m 的值是________. 答案:0
15.已知集合A ={1,2,3,4},集合B ={x |x ≤a ,a ∈R},A ∪B =(-∞,5],则a 的值是________.
答案:5
16.设A ,B 是两个非空集合,定义集合A -B ={x |x ∈A ,且x ∉B }.若A =
{x∈N|0≤x≤5},B={x|x2-7x+10<0},则A-B=________.
解析:∵A={x∈N|0≤x≤5}={0,1,2,3,4,5},B={x|x2-7x+10<0}={x|2<x<5},A-B={x|x∈A且x∉B},
∴A-B={0,1,2,5}.
答案:{0,1,2,5}
17.已知集合M={x|y=x-1},N={x|y=log2(2-x)},则∁R(M∩N)=________.解析:由题意可得M={x|x≥1},N={x|x<2},∴M∩N={x|1≤x<2}.∴∁R(M∩N)={x|x<1或x≥2},即∁R(M∩N)=(-∞,1)∪[2,+∞).答案:(-∞,1)∪[2,+∞)