集合复****知识点及****题
一 、集合运算中常见结论
1.A ?B ?A ∩B=A ?A ∪B=B
2.C U (A ∩B)=(C U A ) ∪ (C U B );C U (A ∪B )=(C U A ) ∩
集合复****知识点及****题
一 、集合运算中常见结论
1.A ?B ?A ∩B=A ?A ∪B=B
2.C U (A ∩B)=(C U A ) ∪ (C U B );C U (A ∪B )=(C U A ) ∩ (C U B ); 3.对于空集有:
1).对于任何集合A ,都有??A
2).对于任何非空集合A ,都有??A 3).对于任何集合A ,都有?∩A =? 4).对于任何集合A ,都有?∪A=A
1.(08四川1)设集合U ={1,2,3,4,5}, A ={1,2,3},B ={2,3,4},则C U (A ∩B ) =( ) (A) {2,3} (B){1,4,5} (C) {4,5} (D){1,5}
2.(08浙江2)已知U =R ,A ={x | x >0},B ={x | x ≤-1},则 (A ∩C U B )∪(B ∩C U A )= ( ) (A) ? (B){x | x ≤0} (C) {x | x >-1} (D){x | x >0或x ≤-1}
3.(08天津6)设集合S = {x | |x-2|>3},T = {x | a 0},B ={x | x ≤-1},则 (A ∩C U B )∪(B ∩C U A )= ( ) (A) ? (B){x | x ≤0} (C) {x | x >-1} (D){x | x >0或x ≤-1}
3.(08天津6)设集合S = {x | |x-2|>3},T = {x | a <xa
4.(07全国Ⅰ) 设a b ∈R ,,集合{}10b a b a b a ??+=????
,,,,,则b a -=( ) (A) 1 (B)1- (C) 2 (D)2- 即时反馈.
={0122
=++x ax x
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