已知
的展开式中,常数项为40,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b3dc5b8af2933650c28ec9b57f3bf6.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d45ccb2c3447664b00f0587d4fbe91d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b3dc5b8af2933650c28ec9b57f3bf6.png)
更新时间:2016-12-04 20:14:15
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