Question

设集合A={x||4x-1|≥9,x∈R},B={x|≥0,x∈R},则A∩B等于

(    )

A.(-3,-2]                                   B.(-3,-2]∪［0,］

C.(-∞,-3]∪［+∞)                 D.(-∞,-3)∪［,+∞)

Answer 1

解析：A={x|x≥或x≤-2},B={x|x＜-3或x≥0},∴A∩B={x|x＜-3或x≥}.

答案：D