设全集为R,A={x|x2-5x-6>0},B={x||x-5|<a}(a为常数),11∈B,则( )
A: (CRA)∪B=R
B: A∪CRB=R
C: CRA∪CRB=R
D: A∪B=R
A: (CRA)∪B=R
B: A∪CRB=R
C: CRA∪CRB=R
D: A∪B=R
举一反三
- 设全集为R,集合A={x|(3-x)≥-2},B={x|},求?R(A∩B).
- 集合A={x|x+2>0},B={x|x-5<0},则A∪B= A: (-2,5) B: R C: (-∞,5) D: (-∞,-2)∪(5,+∞)
- 设全集U=R,集合A={x|2≤x<7},B={x>5},求
- 设A,B,R是三个集合,其中R是实数集,A = {x | -1≤x≤1, xÎR}, B = {x | 0≤x < 2, xÎR},则A-B = ____;B-A = , A∩B =
- 设随机变量X服从参数为r的泊松分布,且3P{ X =2}= P{ X=4},,则r=( ) A: 1 B: 2 C: 5 D: 6