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{1,2} {1,2,3,4} {1,2,3} {1,2,4}
{1,2} {1,2,3,4} {1,2,3} {1,2,4}
={0,1,2,3}, ={1,2,4},则集合A.∪B.= ( ) A.{0, 1,2,3,4}B.{1,2,3,4} {1,2} {0}
1,2,3,4 4,3,2,1 1,4,3,2 3,4,1,2
{1} {1,2} {1,2,3} {1,2,3,4}
4,3,2,1 1,2,3,4 1,4,3,2 3,2,4,1
Dim a As Integer a=array(1,2,3,4) Dim a(),b() a=array(1,2,3,4): b=a Dim a As Variant a=array(1,"aSd",tru Dim a()As Variant a=array(1,2,3,4)
={1,2,3,4}, ={x∈N||x|≤2},则A.∩B=( ) A.{1,2,3,4}B.{﹣2,﹣1,0,1,2,3,4} {1,2} {2,3,4}
4,3,2,1 2,4,3,1 1,2,3,4 3,2,1,4
Dim a As Integer a=array(1,2,3,4) Dim a(),b() a=array(1,2,3,4):b=a Dim a As Variant a=array(1,"asd",tru Dim a()As Variant a=array(1,2,3,4)
4,3,2,1 1,2,3,4 1,4,3,2 3,2,4,1
Dim a As Integer a=array(1,2,3,4) Dim a(),b() a=array(1,2,3,4):b=a Dim a As Variant a=array(1,"asd",true) Dim a()As Variant a=array(1,2,3,4)
Dim a As Integer a=array(1,2,3,4) Dim a(),b() a=array(1,2,3,4):b=a Dim a As Variant a=array(1,"asd",tru Dim a()As Variant a=array(1,2,3,4)
={1,2,3,4}, ={x∈R.|1<x≤4},则A.∩B.=( ) A.{1,2,3,4}B.{2,4} {2,3,4} {x|1<x≤4}
={x|x<3}. ={1,2,3,4},则( R.A.)∩B.= (A.){4} (B.){3,4} (C.){2,3,4} ( ){1,2,3,4}
4,3,2,1 1,2,3,4 1,4,3,2 3,2,4,1
{1,2} {1,2,3,4} {1,2,3} {1,2,4}
4,3,2,1 2,4,3,1 1,2,3,4 3,2,1,4