已知U={2,3,4,5,6},M={3,4,5},N={2,4,6},则( )A.M∩N={4,6}B.M∪N=UC.(∁UN )∪M=UD.(∁UM )∩
题型:单选题难度:简单来源:不详
已知U={2,3,4,5,6},M={3,4,5},N={2,4,6},则( )A.M∩N={4,6} | B.M∪N=U | C.(∁UN )∪M=U | D.(∁UM )∩N=N |
|
答案
∵全集U={2,3,4,5,6},M={3,4,5},N={2,4,6}, ∴CUM={2,6},CUN=[3,5}. ∴M∩N={4},故A错; M∪N={2,3,4,5,6}=U,故B对; (CUN)∪M={3,4,5},故C错; (CUM)∩N={2},故D错. 故选B. |
举一反三
已知集合A={0,1},B={-1,0,a+3},且A⊆B,则a等于( ) |
设全集U=R,集合A={x|-1<x<3},B={y|y=2x},x∈(-∞,2],C={x|a<x<a+1}. (I)求B,并求(∁UA)∩(∁UB); (II)若C⊆(A∩B),求实数a的取值范围. |
若集合M=(x,y)|x+y=0,N=(x,y)|x2+y2=0,x∈R,y∈R,则有( )A.M∪N=M | B.M∪N=N | C.M∩N=M | D.M∩N=∅ |
|
设A、B是两个非空集合,定义A与B差集为A-B={x|x∈A,且x∉B},则A-(A-B)等于( ) |
若∅⊊{x|x2≤a,a∈R},则a的取值范围是( )A.[0,+∞) | B.(0,+∞) | C.(-∞,0] | D.(-∞,0) |
|
最新试题
热门考点