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已知全集U=R.集合A={x|1≤x≤3},集合B={x|3x>9}. (1)求(∁UB)∪A; (2)若集合C={x|a<x≤a+1},且集合A与集合C满足C∩A=C,求实数a的取值范围.
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高二下学期数学《》真题及答案
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设全集为R.集合
={x∈Z|﹣1<x≤3},集合
={1,2},则集合A.∩(∁
R.
B.)=( ) A.{0,3}B.{﹣1,0,1,2,3}
{﹣1,0,3}
{﹣1,0}
.已知全集U=R集合A.={x|x≤1或x≥3}集合B.={x|k<x<2k+1}且∁UA∩B=∅求
已知全集U.={12345}集合
={x|x
2
-3x+2=0},
={x|x=2a,a∈A.},则集合∁
U.
(A.∪B.)中元素的个数为( ) A.1B.2
3
4
已知全集U.={12345}集合A.={123}集合A.∪B.=U.集合A.∩B.=∅则∁U.B.=
题面已知关于x的二次函数fx=ax2-4bx+1.设集合P.={-112345}和Q.={-2-11
已知全集U.=R.集合
={1,2,3,4,5},
={x∈R|x≥2},则右图中阴影部分所表示的集合为( ) A.{1} B.{0,1}
{1,2}
{0,1,2}
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