题目

M={α|α=-,k∈Z},N={α|-π＜α≤π},则M∩N为(    ) A.{-,}                                       B.{-,}C.{-,,,-}                      D.{,-} 答案：解析:∵α=-,-π＜α≤π, ∴-π＜-≤π,k∈Z.解得k=-1,0,1,2,即M∩N={-,-,,}.答案:C

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