题目

设A＝{x||x+1|≤2}，B＝{x|x2－5x+6≥0}，则A、B之间的关系是 A.AB                                                           B.A＝BC.AB                                                          D.A∩B＝ 答案：解析：∵A＝{x|－3≤x≤1}，B＝{x|x≤2或x≥3}，∴AB. 答案：C

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