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设<em>A</em>、<em>B</em>是两个任意集合，则<em>A</em>-<em>B</em> = <img alt="" height="19" src="/api/uploads/1698148/in-rich-contentcreated_at=1647535164" style="vertical-align: middle;" width="17"><img alt="" height="12" src="/api/uploads/1698149/in-rich-contentcreated_at=1647535164" style="vertical-align: middle;" width="22"> ( )．(单选题)
.<em>A</em>=<em>B</em>
.<em>A<img alt="" height="16" src="/api/uploads/1698150/in-rich-contentcreated_at=1647535164" style="vertical-align: middle;" width="16"></em><em>B</em>
.<em>A<img alt="" height="17" src="/api/uploads/1698151/in-rich-contentcreated_at=1647535164" style="vertical-align: middle;" width="17"></em><em>B</em>
.<em>B </em>=\xa0<img alt="" height="19" src="/api/uploads/1698152/in-rich-contentcreated_at=1647535164" style="vertical-align: middle;" width="17">

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出自：2024年国家开放大学答案

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