![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1645b07f937b9b2173a9ad51d1099495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
更新时间:2023-04-16 16:22:36
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【推荐1】在
的展开式中,若a=2,则x项的系数为________ ;若所有项的系数之和为-32,则实数a的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba20419cb479c581ea5409e14aa419f.png)
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【推荐2】已知
的展开式中,含
项的系数等于280,则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a07132f3ab043dcb0983934c177a4e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d800f03de80068a1172beac3a2c75587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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