Union intersection
union and intersection of two sets
Practice questions
- 1已知集合A={0,1,2,3,4,5},B={1,3,6,9},C={3,7,8},则(A∩B)∪C等于 A. {0,1,2,6}…
- 2On the Venn diagram, shade the region that represents A′∪B. Use set notation to describe the shaded region.
- 3已知集合A={x|-5<2x+1<7},B={x|-2<x<4},则A∩B=( ) A. {x|-3<x<4} B. {x|-2<x<4} C. {x|-3<x<3} D. {x|-2<x<3}
- 4已知集合A={x∣3<x<6},B={x∣2<x<9}.(1)设全集U=R,求∁U(A∩B); (2)已知集合C={x∣a<x<a+1},若C⊆B,求实数a…
- 5ξ={integers x:2<x≤12} A={prime numbers} B={factors of 12} C={greater than 100}…
- 6已知集合A={0,1,2,3,4,6,7},集合B={1,2,4,8,0},则A∩B=( ) A. {1,2,4,0} B. {2,4,8} C. {1,2,8} D. {1,2,9}
- 7On the Venn Diagram shown in the answer space, shade the set A∩B′. ε=x:x is an integer and 1≤x≤100…
- 8已知[x]表示不超过x的最大整数,称为高斯取整函数,例如[3.4]=3,[−4.2]=−5,方程[2x2−x]=0的解集为A,集合B={x∣6x2−5ax+a2>0}…
- 9已知集合A={x∈z∣∣x∣⩽2},B={xx+2x−2⩽0},则() A. A∩B=A…
- 10三年级(2)班有56名学生,这个月进行了两次数学测试:第一次得100分的学生的学号是6,9,15,16,27,33,56;第二次得100分的学生的学号是:7,9,16,27,36,40,48,51,53。 1.第一次得100分的有( )人。…
- 11函数y=x2−2x+3+log3(x+2)的定义域为( ) A. (−,∞−1)∪(3,+∞) B. (−∞,−1)∪[3,+∞) C. (−2,−1] D.…
- 12已知集合A={1,a},B={2,3,4},且A∪B={1,2,3,4},则实数a取值的集合是() A. {1,2,3,4} B. {2,3,4} C.…
- 13ε={integer x:0<x≤12} A={prime numbers} B={numbers that have at least 2 distinct factors}…
- 14集合P={x∣x−3x<0},M={x∣x2<9},则P∩M=___.
- 15小李买了钢笔、毛笔、蜡笔,小张买了圆珠笔、铅笔、钢笔.他们一共买了 种笔.
- 16已知集合A={0,1,2,3},B={x∣−1⩽x<3},则A∩B=___.
- 17ϵ={integers x:2≤x≤13} A={prime numbers} B={multiples of 4} C={factors of 12}…
- 18In the Venn diagram below, shade the region A′∩B. Place the five numbers in their correct positions in the Venn d…
- 19已知集合M={x∣2x2−5x−3<0},N={−2,1,2,4},则M∩N=() A. {−2,1,2} B. {1,2} C. {1,4} D. {1,2,4}…
- 20ξ={integers x:0<x<15} A={factors of 15} B={perfect squares} Draw a Venn…
- 21设集合M={x∣0⩽x<2},N={x∣(x−3)(x+1)<0},则集合M∩N= A. {x∣0⩽x<2} B. {x∣0⩽x<3}…
- 22已知A={0,1,2,3,4},B={1,3,5},则A∩B为( ) A. {0,2} B. {1,3} C. {0,1,3} D. {2}
- 23已知集合A={x∣2x2−5x−12⩽0},B={−3,−1,1,3},则A∩B=() A. {−3,−1,1} B. {−1,1} C. {−1,1,3}…
- 24ξ={integers x:1≤x≤16} V={1,2,4,8,16} W={1,4,7,9,10,14} Some of the informa…
- 25ξ = {a,b,c,d,e,i,o,r,s,t,u,v} A = {c,e,d,a,r} B = {v,i,c,t,o,r,a} Find A ∩ B Answer ___ A' ∩ B' Answer ___ Use set notat…
- 26三年级学生中有54人订了《数学月刊》,有38人订《英语月刊》(每人至少订一种杂志),其中两种杂志都订的有20人,三年级一共有 ___人。
- 27已知复数z=(2m2−m−1)+(m2+2m−3)i,m∈R(1)当 m取什么值时,复数 z是纯虚数; (2)当复数 z在复平面内对应的点位于第四象限时,求 m的取值…
- 28已知集合M={x∣x−12⩾0}.集合N={x∣2x+3>0},则(∁RM)∩N=() A. [−23,1) B. (−23,1)…
- 29满足A⊆{a,b,c}且A∩{a,b}={a}的集合A的个数有 .
- 30ξ={x:x is an integer, 2≤x≤14} A={x:x is a prime number} B={x:x is a multiple of 3}…
- 31设集合S={x||x|<5},T={x|(x+7)(x-3)<0}.则S∩T=( ) A. {x|-7<x<5 } B. {x|3<x<5 } C. {x|-5<x<3 } D. {x|-7<x<-5 }
- 32ξ={x:x is a positive integer and x<10} A={2,3,5,7} B={1,4,9} C={2,4,7} Circle the…
- 33On the Venn diagram, shade the region which represents Q∪P′. Let ξ={integers x:1≤x≤9}…
- 34已知命题p:关于 x 的不等式 mx−1≥0 的解集为A,且 2∈A ;命题q:关于x的方程 x2−2x+m=0 有两个不相等的正实数根. (1)若命题p为真命题,求实数m的范…
- 35设x,y∈R,集合A={1,2x},B={x,y},若A∩B={21},则A∪B=() A. {1,21}…
- 36不等式−1⩽−41x2+x−1<0的解集是 ___.
- 37已知函数f(x)的定义域为[2,8],则函数h(x)=f(2x)+9−x2的定义域为() A. [4,16] B. (−∞,1]∪[3,+∞) C. [3,4]…
- 38设全集为R,A={x∣x2−5x−6>0},B={x∣∣x−5∣<a}(a为常数),11∈B,则() A. (∁RA)∪B=R B. A∪(∁RB)=R…
- 39设集合A={x∣−1<x<6},B={x∣x>2},则A∩B=() A. {x∣x<6} B. {x∣x>2} C. {x∣x>−1} D. {x∣2<x<6}…
- 40已知集合A={x∣x−2>0},B={x∣−2x+8>0}…
- 41已知集合M={x∣y=ln(1−x)},集合N={(x,y)∣y=ex,x∈R}(e为自然对数的底数),则M∩N=() A. {x∣x<1} B. {x∣x>1}…
- 42已知集合M={1,2,3},N={x∈Z|1<x<4},则( ) A. M⊆N B. N=M C. M∩N={2,3} D. M∪N={1,4}
- 43已知集合A=[-1,3),B=(2,5],则A∪B=___.
- 44函数f(x)=1−2xln(x+3)的定义域是 ___ (用区间表示).
- 45若集合M={x|2-x<0},N={x|x-3≤0},则M∩N为( ) A. (-∞,-1)∪(2,3] B. (-∞,3] C. (2,3] D. (1,3]
- 46关于x的方程(a−5)x2−4x−1=0有实数根,则a满足 ___ .
- 47There are 30 members in a community club. All the members take up at least one activity, either aqua aerobics or pickleb…
- 48设全集U=R,集合A={x∣x<−1或2⩽x<3},B={x∣−2⩽x<4},则(∁UA)∪B= ___ .
- 49In a particular month, 21 people took a driving test. One of the 21 people is selected at random. The probability that i…
- 50已知集合A={xy=−x2−x+2},B={x∣lnx<1},则A∩B=()…
- 51The sets P and Q consists of the points whose coordinates (x, y) are given by P = {(x, y) : y = 2x + 3} and Q = {(0, 0),…
- 52ξ={x:x is an integer and 1≤x≤10} A={x:x is a factor of 20} B={x:x is a perfect square}…
- 53ξ={integers x:1≤x≤12} A={integers x:1−2x>−9} B={prime numbers} Li…
- 54设集合A={x∣−1<x<4},B={x∈Z∣0<x<5},则A∩B=() A. {x∣0<x<4} B. {x∣−1<x<5} C. {2,3}…
- 55设集合M={−1,0,1},N={x∣x2=−x},则M∩N=() A. {0} B. {1,0} C. (−1,0) D. {−1,0}
- 56已知集合A={x∈Z∣x<4},B⊆N,则() A. 集合B∪N=N B. 集合A∩B可能是{1,2,3} C. 集合A∩B可能是{−1,1} D…
- 57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}
- 58已知集合A={0,1,2},B={0,2,4},则A∩B= ___ .
- 59对命题p:A∩ϕ=ϕ,命题q:A∪ϕ=A,下列说法正确的是( ) A. p∧q为假 B. p∨q为假 C. ¬p为真 D. ¬q为假
- 60已知集合A={−3,−2,−1,0,1,2},B={x∣x2⩽3},则A∩B=() A. {−1,0,1} B. {0,2} C. {−3,−2,−1,0,1,2}…