题干

已知 ,B=(﹣∞,a),若A∩B=A,求实数a的取值范围.

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答案(点此获取答案解析)

解:由题意得:A={x|1≤x<4}

∵A∩B=A

∴A⊆B,a≥4

∴实数a的取值范围是4,+∞)

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