A.(-∞,-2]U[1,2] B.(-∞,-2]U{-1}U[1,2] C

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问题 A.(-∞,-2]U[1,2]B.(-∞,-2]U{-1}U[1,2]C.(-∞,-2]U(-1)U(1,2)D.(-∞,-2]U(-1)U(1,2]E.以上选项均不正确

选项 A.(-∞,-2]U[1,2]
B.(-∞,-2]U{-1}U[1,2]
C.(-∞,-2]U(-1)U(1,2)
D.(-∞,-2]U(-1)U(1,2]
E.以上选项均不正确

答案 B

解析
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