设集合A={4,5,7,9},B={3,4,7,8,9},全集U=A∪B,则集合∁U(A∩B)中元素个数为______.
题型:填空题难度:一般来源:不详
设集合A={4,5,7,9},B={3,4,7,8,9},全集U=A∪B,则集合∁U(A∩B)中元素个数为______. |
答案
∵集合A={4,5,7,9},B={3,4,7,8,9},全集U=A∪B, ∴U=A∪B={3,4,5,7,8,9}, ∵A∩B={4,7,9}, ∴CU(A∩B)={3,5,8}, 共3个元素, 故答案为3. |
举一反三
已知集合A={x|3≤x≤7},B={x|2<x<10},C={x|x<a}. (1)求A∪B; (2)求(CRA)∩B; (3)若A⊆C,求a的取值范围. |
设集合S={y|y=3x,x∈R},T={y|y=x2+1,x∈R},则S∩T=( ) |
已知A={x|a-1≤x≤a+3},B={x|x<-2或x>5} (1)若A∩B=∅,求a的取值范围; (2)若A∪B=B,求a的取值范围. |
已知集合A={x|2<2x<128},集合B={x|a+1<x<2a+5}. (1)若满足A∩B={x|3<x<7},求实数a的值; (2)若满足B⊆A,求实数a的取值范围. |
设集合U={0,1,2,3,4,5},A={1,2},B={x∈Z|x2-5x+4<0},则∁U(A∪B)=( )A.{0,1,2,3} | B.{5} | C.{1,2,4} | D.{0,4,5} |
|
最新试题
热门考点