![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fd88bebb7d93904d19474191ca80989.png)
更新时间:2021-12-15 21:29:25
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【推荐2】已知
展开式的常数项为15,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a397d447e4f5de984fc8735faf17475b.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c218f3e42dbb080959290976fe7a453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a397d447e4f5de984fc8735faf17475b.png)
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