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(-∞,2] [1,2] [-2,2] [-2,1]
={x∈R.||x|≤2}, ={x∈R.|x≤1},则A.∩B.=( ) A.(-∞,2]B.[1,2] [-2,2] [-2,1]
(﹣2,3) (﹣3,﹣2] [﹣2,2) (﹣3,3]
={x∈R. ||x|≤2},B={x∈R. |x≤1},则A.∩ = ( ) A.(-∞,2] B.[1,2] [-2,2] [-2,1]
(-∞,2] [1,2] [-2,2] [-2,1]
={x∈R||x|≤2}, ={x∈R|x≤1},则A.∩B.=( ) A.(﹣∞,2]B.[1,2] [﹣2,2] [﹣2,1]
={x|log2x<1}, ={x|x2+x﹣2<0},则A.∪B.( ) A.(﹣∞,2)B.(0,1) (﹣2,2) (﹣∞,1)
={x|x2+mx+4=0}为空集,则实数m的取值范围是( ) A.(-4,4) [-4,4] (-2,2) [-2,2]
={x|x+2=0},集合 ={x|x2-4=0},则A.∩B.=( ) A.{-2}B.{2} {-2,2} ∅
={x|x2<2-x},B ={x|一1<x<2},则AUB= A.(一1,1) (一2,2) (一1,2) (一2,1)
={1,2,3,4},集合,集合,则集合C.的真子集的个数为( ) A. 1 2 3 4