集合A ="{x" ︳-1≤x≤2} ,B =" {x" ︱x<1} ,则A ∩(B)= (      )A .{x ︳x>1}                

集合A ="{x" ︳-1≤x≤2} ,B =" {x" ︱x<1} ,则A ∩(B)= (      )A .{x ︳x>1}                

题型:单选题难度:一般来源:不详
集合A ="{x" ︳-1≤x≤2} ,B =" {x" ︱x<1} ,则A ∩(B)= (      )
A .{x ︳x>1}                  B .{x ︳x≥1}  
C .{x ︳1<x≤2}              D .{x ︳1≤x≤2}
答案
D
解析

举一反三
设全集U={1,2,3,  4,5,  6,7,8},集合S="{1," 3, 5}, T="{3," 6},则Cu(SUT)="(     " )
A.B.{1, 3,5, 6}C.{2, 4,7, 8}D.{2, 4,6, 8}

题型:单选题难度:简单| 查看答案
(本小题满分8分)
已知全集U=,集合A={,集合B=
求:(1)        (2)
题型:解答题难度:简单| 查看答案
A={x|x2-2x-3>0},B={x|x2+axb≤0},若 AB=R,AB=(3,4],则a b等于 (  )
A.7B.-1C.1D.-7

题型:单选题难度:一般| 查看答案
满足条件M=的集合M是(  )
A.1B.2C.3D.4

题型:单选题难度:简单| 查看答案
(本小题满分9分)已知R为全集,,求(RA
题型:解答题难度:简单| 查看答案
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