设全集 U =R, A ={ x | x ≥1}, B ={ x |-1≤ x <2},则? U ( A ∩ B )=________.
设全集U=R,A={x|x≥1},B={x|-1≤x<2},则?U(A∩B)=________....
设全集 U =R, A ={ x | x ≥1}, B ={ x |-1≤ x <2},则? U ( A ∩ B )=________.
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