![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6614acb66669abb4f868b94cffdd2e31.png)
更新时间:2020-05-15 17:52:50
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【推荐2】若
展开式中第6项的二项式系数与系数分别为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/788a5cf179d4fab34e5cbbd9c8dc4630.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d944e4308480190680a18223a64674.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39ad04a78e7320dfb3c2580038cff38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/788a5cf179d4fab34e5cbbd9c8dc4630.png)
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