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={1,2,4}, ={2,3,4},则=( ) A.{2, 4} B.{1,3} {1,2,3,4}
{1,2,3,4,6} {1,2,3,4,5} {1,2,5} {1,2}
={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}
{1,2,3,4,6} {1,2,3,4,5} {1,2,5} {1,2}
={x|x=2n,n∈N*}, ={x≤2},则A.∩B.=( ) A.{2}B.{2,4} {2,3,4} {1,2,3,4}
={1,2,3,4},集合 ={﹣1,﹣2},设映射f:A.→B.,若集合B.中的元素都是A.中元素在f下的象,那么这样的映射f有 ( ) A.16个B.14个 12个 8个
{4} {1,4} {2,3} {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}
{5} {1,2,5} {2,3,4} {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}
={1,2}, ={2,4},则 U.(A.∪B.)=( ) A.{2} B.{3} C.{1,2,4} {1,4}
={x|x<3}. ={1,2,3,4},则( R.A.)∩B.= (A.){4} (B.){3,4} (C.){2,3,4} ( ){1,2,3,4}
={1,2}, ={2,4},则∁U.(A.∪B.)=( ) A.{2}B.{3} {1,2,4} {1,4}
={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}
={1,2,3}, ={3,4,5},则 (A.){1,2,3,4} (B.){1,2,4,5} ( ){1,2,5} ( ){3}