已知数列
的首项为1,在
展开式中,若
为公差为2的等差数列,展开式中
的系数为______ ;若
为公比为2的等比数列,展开式中
的系数为______ .(用数字作答)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d38876601e02bdb2398fe14ee35d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af9764aa29ce1378f9c6f6c3ceea928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3336c8ed5361c10c37300e41e03f9f2f.png)
更新时间:2023-10-13 18:26:31
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【推荐2】已知线段
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名校
解题方法
【推荐1】将
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【推荐2】已知等比数列
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