已知集合U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},则? U (A∪B)=( ) A.{1,6}
已知集合U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},则?U(A∪B)=()A.{1,6}B.{4,5}C.{2,3,7}D.{2,3,...
已知集合U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},则? U (A∪B)=( ) A.{1,6} B.{4,5} C.{2,3,7} D.{2,3,4,5,7}
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