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{1} {2,3} {1,2,4} {2,3,4}
{3,4} {1,2} {2,3,4} {1,2,3,4}
={1,2}, ={1,2,3}, ={2,3,4},则(A∩B.)∪C.= ( ) A.{1,2,3} B.{1,2,4} C.{2,3,4} {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}
={1,2}, ={2,3,4},那么集合A.∩B.等于( ) A.{2}B.{2,3} {1,2,3} {1,2,3,4}
{1,2,3} {1,2,4} {2,3,4} {1,2,3,4}
={1,2,3},集合 ={2,3,4},则A.∩B.等于( ) A.{2,3}B.{1,2} {3,4} {1,2,3,4}
{1,2,3} {2,3} {1,2} {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}
{1,2} {3,4} {1,2,3,4} {1,2,5,6}
{1,2,3,4} {1,2,3} {2,3,4} {1,3,4}
={4,5,6}, ={2,3,4],则A.∪B.中有( )个元素. A.1B.4 5 6
={1,2}, ={1,2,3},C={2,3,4}则 ( ) (A.) {1,2,3} (B.) {1,2,4} ( ) {2,3,4} ( ) {1,2,3,4}