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更新时间:2021-09-12 10:21:34
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填空题-单空题
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较易
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【推荐1】已知
,则
=___________________ .
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572940026544128/1572940031762432/STEM/2f789be737694482b9bb814107363090.png?resizew=98)
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名校
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【推荐2】若实数x,y满足
,则
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【推荐2】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
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