若
的展示式中
的系数为4,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae6e2a88f1ac183db4bf75454dbd4c8.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/458f0adec7e1a78f2a717ef53d78d91a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d800f03de80068a1172beac3a2c75587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae6e2a88f1ac183db4bf75454dbd4c8.png)
更新时间:2018-01-18 19:54:36
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适中
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解题方法
【推荐1】若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38dd8aad9cfb5e1fe2a45d80923f1571.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/228cb036f045c2a57cc21e8ed79f19c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4255a3148d9b525bcccce66d70c84650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38dd8aad9cfb5e1fe2a45d80923f1571.png)
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