题目

已知A={x|x＜3},B={x|-1＜x＜5},则(A∩B)等于A.{x|x≤-1或3≤x≤5}                       B.{x|x≤-1或x≥3}C.{x|x＜-1或x≥3}                           D.{x|x≤-1或3≤x＜5} 答案：D  ∵A={x|x＜3},B={x|-1＜x＜5},∴A∪B={x|x＜5},A∩B={x|-1＜x＜3}.∴(A∩B)={x|x≤-1或-3≤x＜5}.

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